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Amateur AstronomyMany things have changed in astronomy over the past half-century. Until about 30 years ago, there was a great (1) .... of charts and catalogs. Telescopic equipment was limited and there were few books on practical astronomy. Today, the range of off-the-shelf telescopes and equipment covers almost everything one could need. Electronic calculators and computers have revolutionized almanacs and chart production, and (2) .... the analysis of observations and the publication of...
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Amateur Astronomy

Many things have changed in astronomy over the past half-century. Until about 30 years ago, there was a great (1) .... of charts and catalogs. Telescopic equipment was limited and there were few books on practical astronomy. Today, the range of off-the-shelf telescopes and equipment covers almost everything one could need. Electronic calculators and computers have revolutionized almanacs and chart production, and (2) .... the analysis of observations and the publication of results.

All this must surely make this the golden (3) .... of amateur astronomy. Well, perhaps, but a great deal has been lost as well. Now one may have to travel 80 km to find a sky comparable to that found in urban areas 50 years ago. The daytime skies are now (4) .... by aircraft condensation trails which can (5) .... for hours and often spread out to form amorphous clouds, making solar observations impossible and (6) .... night-time observation too.

1

A deficiency

B shortfall

C inadequacy

D shortage

2

A facilitated

B maximized

C cultivated

D upheld

3

A period

B age

C time

D term

4

A bothered

B plagued

C troubled

D badgered

5

A proceed

B pursue

C prolong

D persist

6

A hampering

B smothering

C overcoming

D combating

1
9 tháng 2 2021

1

A deficiency

B shortfall

C inadequacy

D shortage

2

A facilitated

B maximized

C cultivated

D upheld

3

A period

B age

C time

D term

4

A bothered

B plagued

C troubled

D badgered

5

A proceed

B pursue

C prolong

D persist

6

A hampering

B smothering

C overcoming

D combating

I have always wondered how life was twenty years ago. I (1) __________ that life in the past was boring and inconvenient (2) ___________ the lack of modern facilities. However I changed my opinion after I heard my grandfather talk about his childhood. In the past, although modern and convenient gadgets were not available, everyone really enjoyed the simple and peaceful life. In the family, the father used to be the (3) ___________ while the mother used to just stay home and take care of the...
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I have always wondered how life was twenty years ago. I (1) __________ that life in the past was boring and inconvenient (2) ___________ the lack of modern facilities. However I changed my opinion after I heard my grandfather talk about his childhood. In the past, although modern and convenient gadgets were not available, everyone really enjoyed the simple and peaceful life. In the family, the father used to be the (3) ___________ while the mother used to just stay home and take care of the house. The saying” Men make house, women make home” used to be very popular that day. The children (4) ___________ play video games or go on extra classes after school as we (5) ___________ today. (6) ___________, they could enjoy a variety of outdoor activities with other such as kite flying, rope skipping, so on. In the past, many unique customs of Vietnamese people were seen more vividly than today. (7) ___________, Vietnamese women used to (8) ___________ their teeth black and people used to chew betel nut. It is such a pity that I rarely see those customs today.

1.       A. consumed                 B. presumed                  C. resumed                    D. résumé

2.       A. because           B. despite             C. due to              D. as

3.       A. breadwinner   B. pillar               C. strongest                   D. most important

4.       A. didn’t used to B. didn’t use to    C. used to            D. use to

5.       A. do                    B. did                   C. used to do                 D. didn’t used to do

6.       A. Besides            B. While               C. However                   D. Instead

7.       A. Likewise                   B. For example    C. Therefore                 D. Although

8.       A. color                B. dye                  C. make               D. paint

1
7 tháng 11 2021

1.       A. consumed                 B. presumed                  C. resumed                    D. résumé

2.       A. because           B. despite             C. due to              D. as

3.       A. breadwinner   B. pillar               C. strongest                   D. most important

4.       A. didn’t used to B. didn’t use to    C. used to            D. use to

5.       A. do                    B. did                   C. used to do                 D. didn’t used to do

6.       A. Besides            B. While               C. However                   D. Instead

7.       A. Likewise                   B. For example    C. Therefore                 D. Although

8.       A. color                B. dye                  C. make               D. paint

WATER SPORTS Recreational diving or sport diving is a type of diving that uses scuba equipment for the purpose of leisure and enjoyment. In some diving circles, the term "recreational diving" is used in contradistinction to "technical diving", a more demanding aspect of the sport which requires greater levels of training, experience and equipment. Recreational scuba diving grew out of related activities such as snorkeling and underwater hunting. For a long time, recreational underwater...
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WATER SPORTS

Recreational diving or sport diving is a type of diving that uses scuba equipment for the purpose of leisure and enjoyment. In some diving circles, the term "recreational diving" is used in contradistinction to "technical diving", a more demanding aspect of the sport which requires greater levels of training, experience and equipment.

Recreational scuba diving grew out of related activities such as snorkeling and underwater hunting. For a long time, recreational underwater excursions were limited by the amount of breath that could be held. However, the invention of the aqualung in 1943 by Jacques-Yves Cousteau and its development over subsequent years led to a revolution in recreational diving. However, for much of the 1950s and early1960s, recreational scuba diving was a sport limited to those who were able to afford or make their own kit, and prepared to undergo intensive training to use it. As the sport became more popular, manufacturers became aware of the potential market, and equipment began to appear that was easy to use, affordable and reliable. Continued advances in' SCUBA technology, such as buoyancy compensators, modern diving regulators, wet or dry suits, and dive computers, increased the safety, comfort and convenience of the gear encouraging more people to train and use it.

Until the early 1950s, navies and other organizations performing professional diving were the only providers of diver training, but only for their own personnel and only using their own types of equipment. There were no training courses available to civilians who bought the first scuba equipment. Professional instruction started in 1959 when the non-profit National Association of Underwater Instructors was formed.

Further developments in technology have reduced the cost of training and diving. Scuba-diving has become a popular leisure activity, and many diving locations have some form of dive shop presence that can offer air fills, equipment and training. In tropical and sub-tropical parts of the world, there is a large market in holiday divers, who train and dive while on holiday, but rarely dive close to home. Generally, recreational diving depths are limited to a maximum of between 30 and 40 meters (100 and 130 feet), beyond which a variety of safety issues make it unsafe to dive using recreation diving equipment and practices, and specialized training and equipment for technical diving are needed.

According to the second paragraph, in the 1950s and early 1960s, recreational scuba diving was a sport limited because _______.

A. divers did not like to take part in any intensive training courses

B. there were not any intensive training courses for divers

C. there were not enough kit for many divers

D. kit and intensive training were too expensive for many people to afford

1
8 tháng 9 2017

Đáp án D

Theo như đoạn văn số 2, trong suốt những năm 1950 và 1960, môn lặn giải trí là một thể thao chỉ dành cho một số người nhất định bởi ________.

A. Những người lặn không thích tham gia vao các khóa huấn luyện chuyên sâu

B. Không có bất cứ một khóa huấn luyện chuyên sâu nào cho người lặn

C. Không có đủ đồ cho nhiều người lặn

D. Đồ lặn và các khóa huấn luyện chuyên sâu là quá đắt cho nhiều người có thể trả.

Theo thông tin của đoạn văn số 2:

However, for much of the 19505 and early19605, recreational scuba diving was a sport limited to those who were able to afford or make their own kit, and prepared to undergo intensive training to use it. (Tuy nhiên, trong những năm 1950 và 1960, môn lặn giải trí là một môn thể thao chỉ dành cho những người người mà có thể đủ sức trả cho những đồ lặn và những khóa huấn luyện chuyên sâu để thực hành nó.)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42.WATER SPORTSRecreational diving or sport diving is a type of diving that uses scuba equipment for the purpose of leisure and enjoyment. In some diving circles, the term "recreational diving" is used in contradistinction to "technical diving", a more demanding aspect of the sport which requires greater levels of training, experience and...
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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42.

WATER SPORTS

Recreational diving or sport diving is a type of diving that uses scuba equipment for the purpose of leisure and enjoyment. In some diving circles, the term "recreational diving" is used in contradistinction to "technical diving", a more demanding aspect of the sport which requires greater levels of training, experience and equipment.

Recreational scuba diving grew out of related activities such as snorkeling and underwater hunting. For a long time, recreational underwater excursions were limited by the amount of breath that could be held. However, the invention of the aqualung in 1943 by Jacques-Yves Cousteau and its development over subsequent years led to a revolution in recreational diving. However, for much of the 1950s and early1960s, recreational scuba diving was a sport limited to those who were able to afford or make their own kit, and prepared to undergo intensive training to use it. As the sport became more popular, manufacturers became aware of the potential market, and equipment began to appear that was easy to use, affordable and reliable. Continued advances in' SCUBA technology, such as buoyancy compensators, modern diving regulators, wet or dry suits, and dive computers, increased the safety, comfort and convenience of the gear encouraging more people to train and use it.

Until the early 1950s, navies and other organizations performing professional diving were the only providers of diver training, but only for their own personnel and only using their own types of equipment. There were no training courses available to civilians who bought the first scuba equipment. Professional instruction started in 1959 when the non-profit National Association of Underwater Instructors was formed.

Further developments in technology have reduced the cost of training and diving. Scuba-diving has become a popular leisure activity, and many diving locations have some form of dive shop presence that can offer air fills, equipment and training. In tropical and sub-tropical parts of the world, there is a large market in holiday divers, who train and dive while on holiday, but rarely dive close to home. Generally, recreational diving depths are limited to a maximum of between 30 and 40 meters (100 and 130 feet), beyond which a variety of safety issues make it unsafe to dive using recreation diving equipment and practices, and specialized training and equipment for technical diving are needed.

According to the second paragraph, in the 1950s and early 1960s, recreational scuba diving was a sport limited because _______.

A. divers did not like to take part in any intensive training courses

B. there were not any intensive training courses for divers

C. there were not enough kit for many divers

D. kit and intensive training were too expensive for many people to afford

1
14 tháng 4 2017

Đáp án D

Theo như đoạn văn số 2, trong suốt những năm 1950 và 1960, môn lặn giải trí là một thể thao chỉ dành cho một số người nhất định bởi ________.

A. Những người lặn không thích tham gia vao các khóa huấn luyện chuyên sâu

B. Không có bất cứ một khóa huấn luyện chuyên sâu nào cho người lặn

C. Không có đủ đồ cho nhiều người lặn

D. Đồ lặn và các khóa huấn luyện chuyên sâu là quá đắt cho nhiều người có thể trả.

Theo thông tin của đoạn văn số 2:

However, for much of the 19505 and early19605, recreational scuba diving was a sport limited to those who were able to afford or make their own kit, and prepared to undergo intensive training to use it. (Tuy nhiên, trong những năm 1950 và 1960, môn lặn giải trí là một môn thể thao chỉ dành cho những người người mà có thể đủ sức trả cho những đồ lặn và những khóa huấn luyện chuyên sâu để thực hành nó.)

WATER SPORTS Recreational diving or sport diving is a type of diving that uses scuba equipment for the purpose of leisure and enjoyment. In some diving circles, the term "recreational diving" is used in contradistinction to "technical diving", a more demanding aspect of the sport which requires greater levels of training, experience and equipment. Recreational scuba diving grew out of related activities such as snorkeling and underwater hunting. For a long time, recreational underwater...
Đọc tiếp

WATER SPORTS

Recreational diving or sport diving is a type of diving that uses scuba equipment for the purpose of leisure and enjoyment. In some diving circles, the term "recreational diving" is used in contradistinction to "technical diving", a more demanding aspect of the sport which requires greater levels of training, experience and equipment.

Recreational scuba diving grew out of related activities such as snorkeling and underwater hunting. For a long time, recreational underwater excursions were limited by the amount of breath that could be held. However, the invention of the aqualung in 1943 by Jacques-Yves Cousteau and its development over subsequent years led to a revolution in recreational diving. However, for much of the 1950s and early1960s, recreational scuba diving was a sport limited to those who were able to afford or make their own kit, and prepared to undergo intensive training to use it. As the sport became more popular, manufacturers became aware of the potential market, and equipment began to appear that was easy to use, affordable and reliable. Continued advances in' SCUBA technology, such as buoyancy compensators, modern diving regulators, wet or dry suits, and dive computers, increased the safety, comfort and convenience of the gear encouraging more people to train and use it.

Until the early 1950s, navies and other organizations performing professional diving were the only providers of diver training, but only for their own personnel and only using their own types of equipment. There were no training courses available to civilians who bought the first scuba equipment. Professional instruction started in 1959 when the non-profit National Association of Underwater Instructors was formed.

Further developments in technology have reduced the cost of training and diving. Scuba-diving has become a popular leisure activity, and many diving locations have some form of dive shop presence that can offer air fills, equipment and training. In tropical and sub-tropical parts of the world, there is a large market in holiday divers, who train and dive while on holiday, but rarely dive close to home. Generally, recreational diving depths are limited to a maximum of between 30 and 40 meters (100 and 130 feet), beyond which a variety of safety issues make it unsafe to dive using recreation diving equipment and practices, and specialized training and equipment for technical diving are needed.

Recreational underwater excursions used to be limited _______.

A. as underwater hunting was banned

B. because the necessary amount of breath was too expensive to afford

C. because divers could not take enough amount of breath with them

D. because the necessary amount of breath was too heavy to bring

1
12 tháng 10 2017

Đáp án C

Những chuyến du ngoạn dưới nước trước đây từng bị hạn chế ________.

A. Vì việc săn bắt dưới nước bị cấm

B. Bởi vì những thứ cần thiết đảm bảo cho việc thờ được ở dưới nước là quá đắt để chi trả.

C. Bởi vì những người lặn không thể mang đủ oxi để thở dưới nước

D. Bởi vì những thứ cần thiết cho việc thở ở dưới nước là quá nặng để mang.

Theo thông tin ở đoan văn số 2:

          For a long time, recreational underwater excursions were limited by the amount of breath that could be held. (Trong một thời gian dài, những chuyến du ngoạn ở dưới nước đã bị bạn chế bởi số lượng oxi có thế mang theo.)

6 tháng 12 2017

one hundred years ago, there was no equality between men and women because people then considered women to be weaker sex. This prejudice against women(1) had its origin in the dawn of mankind’s(2) thoughts when men lived in caves and went(3)hunting for food. The task of food gathering and hunting needed great (4)strength of body. Therefore the best place for women was not in the forest, but at home where they could satisfactorily do their jobs, namely feeding their children, and looking after them(5)Things have changed much since those early days. In the modern life of twentieth century, more brains are(6)needed, not more strength of muscle. As a consequence, women play an(7)increasingly important role in the modern society. They have proved repeatedly that they are equal and often superior to men in(8)almost every field

WATER SPORTS Recreational diving or sport diving is a type of diving that uses scuba equipment for the purpose of leisure and enjoyment. In some diving circles, the term "recreational diving" is used in contradistinction to "technical diving", a more demanding aspect of the sport which requires greater levels of training, experience and equipment. Recreational scuba diving grew out of related activities such as snorkeling and underwater hunting. For a long time, recreational underwater...
Đọc tiếp

WATER SPORTS

Recreational diving or sport diving is a type of diving that uses scuba equipment for the purpose of leisure and enjoyment. In some diving circles, the term "recreational diving" is used in contradistinction to "technical diving", a more demanding aspect of the sport which requires greater levels of training, experience and equipment.

Recreational scuba diving grew out of related activities such as snorkeling and underwater hunting. For a long time, recreational underwater excursions were limited by the amount of breath that could be held. However, the invention of the aqualung in 1943 by Jacques-Yves Cousteau and its development over subsequent years led to a revolution in recreational diving. However, for much of the 1950s and early1960s, recreational scuba diving was a sport limited to those who were able to afford or make their own kit, and prepared to undergo intensive training to use it. As the sport became more popular, manufacturers became aware of the potential market, and equipment began to appear that was easy to use, affordable and reliable. Continued advances in' SCUBA technology, such as buoyancy compensators, modern diving regulators, wet or dry suits, and dive computers, increased the safety, comfort and convenience of the gear encouraging more people to train and use it.

Until the early 1950s, navies and other organizations performing professional diving were the only providers of diver training, but only for their own personnel and only using their own types of equipment. There were no training courses available to civilians who bought the first scuba equipment. Professional instruction started in 1959 when the non-profit National Association of Underwater Instructors was formed.

Further developments in technology have reduced the cost of training and diving. Scuba-diving has become a popular leisure activity, and many diving locations have some form of dive shop presence that can offer air fills, equipment and training. In tropical and sub-tropical parts of the world, there is a large market in holiday divers, who train and dive while on holiday, but rarely dive close to home. Generally, recreational diving depths are limited to a maximum of between 30 and 40 meters (100 and 130 feet), beyond which a variety of safety issues make it unsafe to dive using recreation diving equipment and practices, and specialized training and equipment for technical diving are needed.

What is the topic of the passage?

A. The reasons why people like scuba-diving

B. The history of scuba-diving

C. The equipment for scuba-diving

D. The reasons why not many people take up scuba-diving

1
4 tháng 7 2018

Đáp án B

Chủ đề WATER SPORTS

Chủ đề của đoạn văn này là gì?

A. Những lí do giải thích tại sao mọi người thích môn lặn

B. Lịch sử của môn lặn

C. Thiết bị cho môn lặn

D. Những lí do giải thích tại sao không có nhiều người luyện tập môn lặn

Xuyên suốt cả bài là nói về lịch sử của môn lặn với rất nhiều sự kiện và mốc thời gian

=> chủ đề của bài là lịch sử của môn lặn.

WATER SPORTS Recreational diving or sport diving is a type of diving that uses scuba equipment for the purpose of leisure and enjoyment. In some diving circles, the term "recreational diving" is used in contradistinction to "technical diving", a more demanding aspect of the sport which requires greater levels of training, experience and equipment. Recreational scuba diving grew out of related activities such as snorkeling and underwater hunting. For a long time, recreational underwater...
Đọc tiếp

WATER SPORTS

Recreational diving or sport diving is a type of diving that uses scuba equipment for the purpose of leisure and enjoyment. In some diving circles, the term "recreational diving" is used in contradistinction to "technical diving", a more demanding aspect of the sport which requires greater levels of training, experience and equipment.

Recreational scuba diving grew out of related activities such as snorkeling and underwater hunting. For a long time, recreational underwater excursions were limited by the amount of breath that could be held. However, the invention of the aqualung in 1943 by Jacques-Yves Cousteau and its development over subsequent years led to a revolution in recreational diving. However, for much of the 1950s and early1960s, recreational scuba diving was a sport limited to those who were able to afford or make their own kit, and prepared to undergo intensive training to use it. As the sport became more popular, manufacturers became aware of the potential market, and equipment began to appear that was easy to use, affordable and reliable. Continued advances in' SCUBA technology, such as buoyancy compensators, modern diving regulators, wet or dry suits, and dive computers, increased the safety, comfort and convenience of the gear encouraging more people to train and use it.

Until the early 1950s, navies and other organizations performing professional diving were the only providers of diver training, but only for their own personnel and only using their own types of equipment. There were no training courses available to civilians who bought the first scuba equipment. Professional instruction started in 1959 when the non-profit National Association of Underwater Instructors was formed.

Further developments in technology have reduced the cost of training and diving. Scuba-diving has become a popular leisure activity, and many diving locations have some form of dive shop presence that can offer air fills, equipment and training. In tropical and sub-tropical parts of the world, there is a large market in holiday divers, who train and dive while on holiday, but rarely dive close to home. Generally, recreational diving depths are limited to a maximum of between 30 and 40 meters (100 and 130 feet), beyond which a variety of safety issues make it unsafe to dive using recreation diving equipment and practices, and specialized training and equipment for technical diving are needed.

Which of the following could best replace the word "subsequent" ?

A. successive       

B. following         

C. ancient    

D. succeeding

1
18 tháng 11 2018

Đáp án B

Từ “subsequent” có thể thay thế bằng từ nào dưới đây:

A. successive (a): liên tục, liên tiếp                      
B. following (a): theo sau, nối tiếp

C. ancient (a): cổ xưa     
D. succeeding (a); tiếp theo, thừa kế

WATER SPORTS Recreational diving or sport diving is a type of diving that uses scuba equipment for the purpose of leisure and enjoyment. In some diving circles, the term "recreational diving" is used in contradistinction to "technical diving", a more demanding aspect of the sport which requires greater levels of training, experience and equipment. Recreational scuba diving grew out of related activities such as snorkeling and underwater hunting. For a long time, recreational underwater...
Đọc tiếp

WATER SPORTS

Recreational diving or sport diving is a type of diving that uses scuba equipment for the purpose of leisure and enjoyment. In some diving circles, the term "recreational diving" is used in contradistinction to "technical diving", a more demanding aspect of the sport which requires greater levels of training, experience and equipment.

Recreational scuba diving grew out of related activities such as snorkeling and underwater hunting. For a long time, recreational underwater excursions were limited by the amount of breath that could be held. However, the invention of the aqualung in 1943 by Jacques-Yves Cousteau and its development over subsequent years led to a revolution in recreational diving. However, for much of the 1950s and early1960s, recreational scuba diving was a sport limited to those who were able to afford or make their own kit, and prepared to undergo intensive training to use it. As the sport became more popular, manufacturers became aware of the potential market, and equipment began to appear that was easy to use, affordable and reliable. Continued advances in' SCUBA technology, such as buoyancy compensators, modern diving regulators, wet or dry suits, and dive computers, increased the safety, comfort and convenience of the gear encouraging more people to train and use it.

Until the early 1950s, navies and other organizations performing professional diving were the only providers of diver training, but only for their own personnel and only using their own types of equipment. There were no training courses available to civilians who bought the first scuba equipment. Professional instruction started in 1959 when the non-profit National Association of Underwater Instructors was formed.

Further developments in technology have reduced the cost of training and diving. Scuba-diving has become a popular leisure activity, and many diving locations have some form of dive shop presence that can offer air fills, equipment and training. In tropical and sub-tropical parts of the world, there is a large market in holiday divers, who train and dive while on holiday, but rarely dive close to home. Generally, recreational diving depths are limited to a maximum of between 30 and 40 meters (100 and 130 feet), beyond which a variety of safety issues make it unsafe to dive using recreation diving equipment and practices, and specialized training and equipment for technical diving are needed.

These following sentences are true EXCEPT ________.

A. In the early 1950s anyone who wanted to dive could be professionally trained.

B. In the early 1950s there were no training courses available to civilians who bought the first scuba equipment.

C. As recreational diving became more popular, manufacturers have made more and more diving equipment.

D. Advances in scuba technology encourage more and more people to train and use it.

1
23 tháng 2 2019

Đáp án A

Tất cả những câu dưới đây đều đúng ngoại trừ _______.

A. Trong những năm 1950 bất cứ ai muốn lặn đều có thể được đào tạo chuyên nghiệp.

B. Trong những năm 1950 không có khóa đào tạo nào có sẵn cho những người người đã mua những thiết bị lặn đời đầu.

C. Khi hoạt động lặn giải trí dần trở lên phổ biến hơn, các nhà sản xuất đã tạo ra nhiều thiết bị lặn hơn.

D. Những tiến bộ trong công nghệ lặn đã khuyến khích ngày càng nhiều người tập luyện và tham gia vào môn thể thao này.

Theo thông tin của đoạn văn số 3:

          Until the early 19505, navies and other organizations performing professional diving were the only providers of diver training, but only for their own personnel and only using their own types of equipment. There were no training courses available to civilians who bought the first scuba equipment. (Cho tới đầu những năm 1950. Quân đội và những tổ chức huấn luyện lặn là những đơn vị duy nhất cung cấp chương trình đào tạo này, nhưng chỉ dành cho nhân viên của họ và chỉ sử dụng thiết bị chuyên dụng của họ. Không có bất cứ khóa huấn luyện nào cho dân thường người mà đã mua những thiết bị lặn đầu tiên.)

WATER SPORTS Recreational diving or sport diving is a type of diving that uses scuba equipment for the purpose of leisure and enjoyment. In some diving circles, the term "recreational diving" is used in contradistinction to "technical diving", a more demanding aspect of the sport which requires greater levels of training, experience and equipment. Recreational scuba diving grew out of related activities such as snorkeling and underwater hunting. For a long time, recreational underwater...
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WATER SPORTS

Recreational diving or sport diving is a type of diving that uses scuba equipment for the purpose of leisure and enjoyment. In some diving circles, the term "recreational diving" is used in contradistinction to "technical diving", a more demanding aspect of the sport which requires greater levels of training, experience and equipment.

Recreational scuba diving grew out of related activities such as snorkeling and underwater hunting. For a long time, recreational underwater excursions were limited by the amount of breath that could be held. However, the invention of the aqualung in 1943 by Jacques-Yves Cousteau and its development over subsequent years led to a revolution in recreational diving. However, for much of the 1950s and early1960s, recreational scuba diving was a sport limited to those who were able to afford or make their own kit, and prepared to undergo intensive training to use it. As the sport became more popular, manufacturers became aware of the potential market, and equipment began to appear that was easy to use, affordable and reliable. Continued advances in' SCUBA technology, such as buoyancy compensators, modern diving regulators, wet or dry suits, and dive computers, increased the safety, comfort and convenience of the gear encouraging more people to train and use it.

Until the early 1950s, navies and other organizations performing professional diving were the only providers of diver training, but only for their own personnel and only using their own types of equipment. There were no training courses available to civilians who bought the first scuba equipment. Professional instruction started in 1959 when the non-profit National Association of Underwater Instructors was formed.

Further developments in technology have reduced the cost of training and diving. Scuba-diving has become a popular leisure activity, and many diving locations have some form of dive shop presence that can offer air fills, equipment and training. In tropical and sub-tropical parts of the world, there is a large market in holiday divers, who train and dive while on holiday, but rarely dive close to home. Generally, recreational diving depths are limited to a maximum of between 30 and 40 meters (100 and 130 feet), beyond which a variety of safety issues make it unsafe to dive using recreation diving equipment and practices, and specialized training and equipment for technical diving are needed.

Recreational diving ______.

A. requires more equipment than technical diving

B. are taken up by many people for leisure and entertainment

C. needs no equipment

D. requires more experience than technical diving

1
7 tháng 2 2018

Đáp án B

Trò lặn giải trí _______.

A. Đòi hỏi thiết bị nhiều hơn là kĩ thuật lặn

B. Được rất nhiều người tham gia như một hoạt động giải trí và thư giãn

C. Không cần thiết bị gì

D. Cần nhiều kinh nghiệm hơn là kĩ thuật lặn

Thông tin ở phần đầu tiên của đoạn văn:

          Recreational diving or sport diving is a type of diving that uses scuba equipment for the purpose of leisure and enjoyment in some diving circles, the term “recreational diving” is used in contradistinction to “technical diving", 3 more demanding aspect of the sport which requires greater levels of training, experience and equipment.

          (Môn giải trí lặn hay là môn thế thao lặn là một loại hình lặn mà nó sử dụng những thiết bị lặn cho mục đích là để thư giãn và giải trí. Ở một số phương diện của môn này, thuật ngữ “recreational diving” được dùng khác với thuật ngữ “technical diving” một lĩnh vực thể thao nhiều thách thức hơn, lĩnh vực này đòi hỏi mức độ cao hơn về sự luyện tập, kinh nghiệm và thiết bị hỗ trợ.)