Fill in each numbered blank with one suitable word or phrase.Are there intel...

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 35 to 44.

Bird migration is one of the most interesting yet least understood natural phenomena. Every fall birds from northern latitudes fly in groups to the warmer southern latitudes and then return north in the spring. Scientists agree on the main reasons for migration: to follow the food supply and to avoid harsh climate conditions. For example, insects disappear during the cold months, prompting insect-dependent birds to fly south to warm areas where insects breed. No similar consensus has emerged, however, about how birds are able to navigate. Despite many recent experiments, bird experts still do not know how birds arrive at the same destinations every year and then find their way back home in the spring.

Some have suggested that birds find their way by following landmarks, such as rivers and mountain ranges. Experiments have confirmed that some species do follow such topographic features. But that method cannot explain how some birds travel at night. Other studies show that some nocturnal birds navigate by the stars. But that explanation cannot explain daytime migration or travel when the skies are cloudy.

The most popular explanation currently is that birds are guided by Earth's magnetic poles. The mechanism by which that works has not yet been proved. One theory points to the fact that some birds' contain magnetite, a naturally occurring magnetic compound consisting of iron oxide. Magnetite has been found in many animals, including birds. With magnets embedded in their brains, birds would be able to sense the magnetic fields of the North and South Poles.

A recent experiment with homing pigeons provided some evidence that magnetite does play a crucial role in migration. Homing pigeons are known to have the ability to return to their homes after being taken hundreds of miles away. Researchers found that they could train homing pigeons to recognize changes in a magnetic field. When a surrounding magnetic field was normal, the birds would gather at one end of a cage. But when the field's polarity was altered, they hopped to the other end, suggesting that they were directing and responding to changes in the magnetic field.

Another theory has been offered to explain this sensitivity to magnetic poles, a theory that draws upon quantum mechanics, which is the study of how particles move inside an atom. It relies on the fact that electrons come in pairs that orbits the nucleus of an atom. The two electrons spin in opposite directions, creating two magnets that neutralize each other. But when molecules split and react with other molecules to form compounds, the electrons pairs may no longer spin in opposite directions. Instead, they may repel each other, as when two north ends of magnets are pressed together. The electrons struggle to change direction in order to achieve a stable state in which the two electrons again neutralize each other, giving off no magnetic field.

Question 35: The word "phenomena" in the passage is closest in meaning to

A. events B. trends C. discoveries D. theories

Question 36: According to paragraph 1, insects influence bird migration in which of the following ways?

A. insects generate a magnetic field that birds can detect

B. Insects provide a food supply that exists only in warm climates

C. Birds follow the paths taken by flying insects

D. birds know when to migrate by a sudden increase in insect population

Question 37: The word "some" in the passage refers to

A. insects B. recent experiments C. bird experts D. birds

Question 38: According to paragraph 3, birds can detect the magnetic fields of the North and South poles because

A. they sense the motion of electron pairs

B. they can locate the poles by following landmarks

C. they ingest metal particles that are attracted by the poles

D. they have magnetite in their brains

Question 39: The word "embedded" in the passage is closest in meaning to

A. implanted B. attached C. attracted D. activated

Question 40: The author discusses "homing pigeons" in paragraph 4 in order to

A. provide an example of how humans can train birds

B. describe an experiment showing the importance of magnetite

C. show that homing pigeons return home by following landmarks

D. report homing pigeons' behavior inside a cage

Question 41: According to the passage, all of the following are theories about how birds navigate EXCEPT:

A. They follow landmarks like rivers and mountains

B. They are guided by their position relative to the stars

C. They feel vibrations in nerve endings in their brains

D. They respond to changes in light

Question 42: According to paragraph 4, the pigeons moved to the opposite end of a cage because

A. The magnetic field was normal

B. The magnetic field was stronger at one end

C. The magnetic field changed its polarity

D. The magnetic field was removed

Question 43: The word "altered" in the passage is closest in meaning to

A. reversed B. cancelled C. strengthened D. detected

Question 44: Which of the following can be inferred about an electron pair in two north ends of magnets?

A. The two electrons spin in opposite directions

B. One electron will move to the south end

C. One electron will be captured by the nucleus

D. The two electrons spin in the same direction

#Tiếng anh lớp 9

1

DE

Đ𝒂𝒏 𝑫𝒊ệ𝒑

24 tháng 7 2019

1B

2B

3C

4C

5A

6D

7B

8A

9C

10D

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TV

Thanh Vi

16 tháng 2 2019

VI.Read the passage carefully, tlien decide whot hen the following,statement are true T) or false (F) There are nine planets in our solar system. These planets each have their atmosphere and environmental conditions. Scientists have been trying to research other planets to see if it is possible for life to exist on the other eight own bodies in space. Mercury and Pluto are probably the most difficult to research because of their position in the solar system. Mercury is so...

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#Tiếng anh lớp 9

1

VN

Vũ Như Quỳnh

16 tháng 2 2019

VI.Read the passage carefully, tlien decide whot hen the following,statement are true T) or false (F)
There are nine planets in our solar system. These planets each have their atmosphere and environmental conditions. Scientists have been trying to research other planets to see if it is possible for life to exist on the other eight own bodies in space.
Mercury and Pluto are probably the most difficult to research because of their position in the solar system. Mercury is so close to the sun that with our current technology a space shuttle would burn up before it even reached its atmosphere. Pluto is so far away that some scientists believe that it may not even be a planot but a large asteroid or comet. A space shuttle can not trave that far away because it is so far away from the sun that it would freeze.
Many scientists also believe that our solar system is not alone in the uni- with us. It is difficult to know if there is life present elaewhere in the universe. for many years to come. yerse. Many believe there are several other systems that share the uhiverse .The universe is a complex structure of space that may continue to be a mysterey for many years to come
32. There are nine planets in our solar system, besides Earth. T
33. It is difficult to study the planet Mercury because it is very close to the sun.T
34. We don't know much about Pluto even though we can see it up close F
35. Pluto may not be a planet, according to some scientists. T
36. Scientists have got enough information about the universe F

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16 tháng 4 2020 - olm

Question 1: Supply the correct forms of the verbs in brackets.1. It is crucial that Dido (stop) using Quang Ha.2. I will ring the bell one more. if he (not answer),I think he must(go) out3. I am sorry about the noise last night. We (have) a party.4. The man who (rescue) had been in the sea for ten hours.5. A great deal of time (be) spent for his exercise.6. We want (pay) better wages.7. People always (blame) their circumstances for what they are.8. You (stop) by a policeman if you (try) to...

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Question 1: Supply the correct forms of the verbs in brackets.

1. It is crucial that Dido (stop) using Quang Ha.

2. I will ring the bell one more. if he (not answer),I think he must(go) out

3. I am sorry about the noise last night. We (have) a party.

4. The man who (rescue) had been in the sea for ten hours.

5. A great deal of time (be) spent for his exercise.

6. We want (pay) better wages.

7. People always (blame) their circumstances for what they are.

8. You (stop) by a policeman if you (try) to cross the road now.

Question 2: Use the correct form of the words in brackets to complete the following passage.

The families in our streets are slowly being driven mad by the .............. (1- refuse) of the inhabitants of No.13 to have any form of ............ (2-communiate) with them. The trouble started over what is known as noise .............. (3 - pollute). Every evening, the ........... (4- think) neighbours used to turn up the volume on the TV so loud that no one in the (5 - neighbour) was able to hear anything else. Not knowing what ............ (6 - act) to take, local residents held a meeting to see if anyone had any ............ (7 - suggest) as to how to deal with the problem. A decision was made to send a number of people to talk to the family in No. 13 and ask them .......

............. (8- polite) to turn their music down after six in the evening. Unfortunately, the visit did not turn out to be ............ (9 - succeed), as the inhabitants of No.13 refused to talk to them. So on the .............. (10 - advise) of local police, the matter is now in the hands of the court.

Question 3: Fill in each numbered blank with a suitable word

When you hear the word "bank", what do you think of ? A ......... (1) to put money? The land on the edge of a river? To depend on something or someone ? If you choose any of .....

............ (2) things, you're right. Why ? because words often have ............. (3) than one meaning. The tricky part is figuring out ........... (4) meaning is appropriate.

Choosing the correct meaning of a word depends on ............. (5) things. First, it depends on the words and ............ (6) surrounding your particular word. The other words and sentences give you context clues. ................. (7), the meaning depends on how the word is ............ (8) in the sentence. Is it a noun, a verb, ................ (9) adjective or part of a phrase? Knowing the word's part of speech will .............. (10) you discover the word's precise meaning.

Question 4: Read the text then choose the correct answer

Computing is now at the same stage as printing was when the first printing presses were used. Before printing presses were invented, only rich people like kings and dukes could afford to buy books. Often these people were unable to read and hadn't enough time to learn. In any case, the books were so big that it was difficult for anyone to relax with a book as we do today. They wanted books because they were expensive and there was something magical about them. Only a few people were able to write, and it took an extremely long time to write a book. Monks and other people who could write said ordinary people could not learn to read.

The position with computers in very similar today. A few years ago, computers were very large and expensive. Business managers and rich people ordered them but they didn’t know how to use them. In many countries, however, the situation has now completely changed. Lots of people not only own microcomputers but also know how to use them.

1. What happened before printing presses were invented ?

a. Books were so big that people didn’t want to buy them.

b. Only intelligent and rich people could read books.

c. Only kings and dukes had enough money to buy books.

d. All rich people bought books.

2. Why were books wanted before printing presses were invented ?

a. to show that the people who owned the books were rich and intelligent.

b. to show that the people who owned the books could write.

c. Because books were dear and magical.

d. Because books showed that the person who owned them were magical people.

3. What is the common feature of a book and a computer?

a. They were only for intelligent people.

b. They were too expensive to buy.

c. They were large and expensive at first.

d. Only people who could use them buy them.

4. What situation has throughly changed nowadays?

a. A lot of people are eager to buy computers

b. A lot of computers are sold

c. Even children can use a computer

d. A person who buys a computer knows how to use it.

Question 5: a/ Each line in the following passage has a spare word; Underline that word and write it in the blanks given.

BICYCLES

The bicycle is a cheap and clean way to for travel . The first	0/ .......for...........
bicycle was made in about one hundred and fifty years ago. At	1/ .......................
first, bicycles were much expensive. Only rich people could	2/ .......................
buy one. These early time bicycles looked very different from	3/ .......................
the ones we have them today. Later, when bicycles became	4/.......................
cheaper, many lot people bought one. People started riding	5/ .......................
bicycles to work and in their with free time. Today, people use	6/ .......................
cars more than bicycles; cars are much more faster and you	7/ .......................
don’t get wet when it start rains! But some people still prefer to	8/ .......................
cycle to work . They say that there have are too many cars in	9/ .......................
town centers and you can't able find anywhere to park!	10/ .....................

b/ Fill in the blanks with a suitable prepositions.

1. George fell .............the bladder while he was painting the ceiling.

2. We stopped everyone .................leaving the building.

3. Admision .................university depends .....................examination results.

4. Don`t use that dictionary. It is .............date. Find one that is ...................date.

Question 6: Do as directed

1. My friend had excellent ideas. He did a good job,too.

(join into one sentence, using not only.....but...as well)

2. His explanation is not clear. The examples he gives are not clear.

(join into one sentence, using : neither...............nor)

3. People say that the price of gold is going up. (change into passive voice.)

4. He asked me: "When will you give this book back to me?" (change into Reported speech)

5. Seldom did people travel far from home years ago. (Use the ordinary word order)

6. He was given a gift. So were you. (Join into one sentence, using "as well")

7. You may be intelligent, but you should be careful about this (start with "No matter........"

8. He made a great discovery. He was very proud of it. (Combine into one sentence)

9. Lan found it difficult to accept the situation. (rewrite with: difficulty)

10.The farmers had applied new technology in their fields. The output of rice was raised.

(Combine with: Thanks to ...........which............)

#Tiếng anh lớp 9

3

LV

Lê Văn Tính

21 tháng 4 2020

hoi cham

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21 tháng 4 2020

cac bn tra loi dc cau nao thi ghi cau day