A watermelon weighs 2kg and contains 92% of water. After putting in the sun, the water of the watermelon only contains 90% of water. At that time, how many kilograms does that watermelon weigh ?

KD

Khánh Đan

12 tháng 1 2022

#Toán lớp 5

1

H

hami

12 tháng 1 2022

Lượng nước trong quả dưa hấu: 2 x 92% = 1,84 (kg)

90% lượng nước còn lại: 1,84 x 90% = 1,656 (kg)

Khối lượng quả dưa bị giảm: 1,84 – 1,656 = 0,184 (kg)

Sau khi phơi nắng quả dưa hấu cân nặng: 2 – 0,184 = 1,816 (kg)

Dịch:Một quả dưa hấu nặng 2kg và chứa 92% là nước. Sau khi đem phơi nắng, phần nước của dưa hấu chỉ còn lại 90% là nước. Hỏi khi đó quả dưa hấu đó nặng bao nhiêu ki-lô-gam?

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NM

Nguyễn Minh Tùng

8 tháng 7 2016 - olm

Problem 8. A cuboid container has dimensions as in the figure. The container has 54 liters of water in it. Bình wants to know a full bucket contains how many liters of water, so he pours the whole bucket of water into the container and finds that the level of the water is now 7 8 the height of the container. From that, he is able to calculate how many liters of water a full bucket contains. If the container is empty, how many buckets of water must Bình pour into the container to make it...

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#Toán lớp 5

2

CB

Cậu Bé Cung Thiên Bình

8 tháng 7 2016

Vấn đề 8. Một container có hình khối có kích thước như trong hình. Các thùng có 54 lít nước trong đó. Bình muốn biết một xô đầy chứa bao nhiêu lít nước , do đó, ông đổ cả xô nước vào container và thấy rằng mức độ của nước tại 7 8 là chiều cao của container. Từ đó, ông có thể tính toán bao nhiêu lít nước một xô đầy chứa . Nếu container rỗng , bao nhiêu xô nước phải Bình đổ vào các container để làm cho nó đầy đủ?

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TH

Trần Hùng

5 tháng 5

To solve this problem, let's break it down step by step.

Step 1: Calculate the volume of the cuboid container.
The volume of a cuboid is given by the formula:
Volume = Length × Width × Height

Given:
Length = 12 meters
Width = 6 meters
Height = 4 meters

Volume = 12 × 6 × 4 = 288 cubic meters

Step 2: Convert the volume to liters.
Since 1 cubic meter = 1000 liters, we have:
Volume = 288 × 1000 = 288,000 liters

Step 3: Determine the volume of water after pouring a full bucket.
The water level after pouring the bucket is at 7/8 the height of the container, which means the volume of water is 7/8 of the volume of the container.

Volume of water = (7/8) × 288,000 liters = 252,000 liters

Step 4: Calculate the volume of water in one bucket.
Since initially, there were 54 liters in the container and after pouring the bucket, there were 252,000 liters, the volume of water in one bucket can be found by subtracting the initial volume from the final volume.

Volume of water in one bucket = 252,000 liters - 54 liters = 251,946 liters

Step 5: Determine how many buckets are needed to fill the container.
To find out how many buckets are needed to fill the container, divide the volume of the container by the volume of water in one bucket.

Number of buckets needed = 288,000 liters / 251,946 liters ≈ 1.144

Since Bình cannot pour a fraction of a bucket, he would need to pour 2 buckets of water to fill the container completely.

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LQ

Lê Quỳnh Anh

2 tháng 10 2019

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 42. Most desert animals will drink water if confronted with it, but many of them never have any opportunity. All living things must have water, or they will expire. The herbivores find it in desert plants. The carnivores slake their thirst with the flesh and blood of living prey. One of the most remarkable adjustments, however, has been...

Đọc tiếp

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 42.

Most desert animals will drink water if confronted with it, but many of them never have any opportunity. All living things must have water, or they will expire. The herbivores find it in desert plants. The carnivores slake their thirst with the flesh and blood of living prey. One of the most remarkable adjustments, however, has been made by the tiny kangaroo rat, who not only lives without drinking but subsists on a diet of dry seeds containing about 5% free water. Like other animals, he has the ability to manufacture water in his body by a metabolic conversion of carbohydrates. But he is notable for the parsimony with which he conserves his small supply by every possible means, expending only minuscule amounts in his excreta and through evaporation from his respiratory tract.

Investigation into how the kangaroo rat can live without drinking water has involved various experiments with these small animals. Could kangaroo rats somehow store water in their bodies and slowly utilize these resources in the long periods when no free water is available from dew or rain? The simplest way to settle this question was to determine the total water content in the animals to see if it decreases as they are kept for long periods on a dry diet. If they slowly use up their water, the body should become increasingly dehydrated, and if they begin with a store of water, this should be evident from an initial high water content. Results of such experiments with kangaroo rats on dry diets for more than 7 weeks showed that the rats maintained their body weight. There was no trend toward a decrease in water content during the long period of water deprivation. When the kangaroo rats were given free access to water, they did not drink water. They did nibble on small pieces of watermelon, but this did not change appreciably the water itent in their bodies, which remained at 66.3 % to 67.2 % during this period.

This is very close to the water content of dry-fed animals (66.5 %), and the availability of free water, therefore, did not lead to any “storage” that could be meaningful as a water reserve. This makes it reasonable to conclude that physiological storage of water is not a factor in the kangaroo rat’s ability to live on dry food.

It is implied by the author that desert animals can exist with little or no water because of _________ .

A. less need for water than other animals

B. many opportunities for them to find water

C. their ability to eat plants

D. their ability to adjust to the desert environment

#Mẫu giáo

1

DH

Dương Hoàn Anh

2 tháng 10 2019

Chọn đáp án D

Tác giả ngụ ý rằng động vật sa mạc có thể tồn tại với rất ít hoặc không cần nước bởi vì _________.

A. ít có nhu cầu nước hơn các động vật khác

B. chúng có nhiều cơ hội tìm nước

C. khả năng ăn thực vật

D. khả năng thích nghi với môi trường sa mạc

Dẫn chứng: The herbivores find it in desert plants. The carnivores slake their thirst with the flesh and blood of living prey. One of the most remarkable adjustments, however, has been made by the tiny kangaroo rat who not only lives without drinking but subsists on a diet of dry seeds containing about 5% free water. Like other animals, he has the ability to manufacture water in his body by a metabolic conversion of carbohydrates.

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LQ

Lê Quỳnh Anh

2 tháng 7 2017

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 42. Most desert animals will drink water if confronted with it, but many of them never have any opportunity. All living things must have water, or they will expire. The herbivores find it in desert plants. The carnivores slake their thirst with the flesh and blood of living prey. One of the most remarkable adjustments, however, has been...

Đọc tiếp

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 42.

Most desert animals will drink water if confronted with it, but many of them never have any opportunity. All living things must have water, or they will expire. The herbivores find it in desert plants. The carnivores slake their thirst with the flesh and blood of living prey. One of the most remarkable adjustments, however, has been made by the tiny kangaroo rat, who not only lives without drinking but subsists on a diet of dry seeds containing about 5% free water. Like other animals, he has the ability to manufacture water in his body by a metabolic conversion of carbohydrates. But he is notable for the parsimony with which he conserves his small supply by every possible means, expending only minuscule amounts in his excreta and through evaporation from his respiratory tract.

Investigation into how the kangaroo rat can live without drinking water has involved various experiments with these small animals. Could kangaroo rats somehow store water in their bodies and slowly utilize these resources in the long periods when no free water is available from dew or rain? The simplest way to settle this question was to determine the total water content in the animals to see if it decreases as they are kept for long periods on a dry diet. If they slowly use up their water, the body should become increasingly dehydrated, and if they begin with a store of water, this should be evident from an initial high water content. Results of such experiments with kangaroo rats on dry diets for more than 7 weeks showed that the rats maintained their body weight. There was no trend toward a decrease in water content during the long period of water deprivation. When the kangaroo rats were given free access to water, they did not drink water. They did nibble on small pieces of watermelon, but this did not change appreciably the water itent in their bodies, which remained at 66.3 % to 67.2 % during this period.

This is very close to the water content of dry-fed animals (66.5 %), and the availability of free water, therefore, did not lead to any “storage” that could be meaningful as a water reserve. This makes it reasonable to conclude that physiological storage of water is not a factor in the kangaroo rat’s ability to live on dry food.

According to the passage, the results of the experiments with kangaroo rats showed that

A. kangaroo rats store water for use during dry periods

B. kangaroo rats took advantage of free access to water

C. there was no significant change in body weight due to lack of water or accessibility to water

D. a dry diet seems detrimental to the kangaroo rat’s health

#Mẫu giáo

1

DH

Dương Hoàn Anh

2 tháng 7 2017

Chọn đáp án C

Theo bài đọc, kết quả của các thí nghiệm với chuột túi chỉ ra rằng _________.

A. chuột túi dự trữ nước để sử dụng suốt thời kì khô hạn

B. chuột túi tận dụng việc tự do tiếp cận nguồn nước

C. không có sự thay đổi đáng kể về trọng lượng cơ thể do thiếu nước hay việc tiếp cận đến nguồn nước.

D. một chế độ ăn khô có vẻ có hại cho sức khỏe của chuột túi

Dẫn chứng: Results of such experiments with kangaroo rats on dry diets for more than 7 weeks showed that the rats maintained their body weight. There was no trend toward a decrease in water content during the long period of water deprivation. When the kangaroo rats were given free access to water, they did not drink water. They did nibble on small pieces of watermelon, but this did not change appreciably the water content in their bodies, which remained at 66.3 % to 67.2 % during this period..."(Kết quả của các thí nghiệm với chuột kangaroo trong chế độ ăn khô trong hơn 7 tuần cho thấy rằng những con chuột vẫn duy trì trọng lượng cơ thể của chúng. Không có xu hướng giảm hàm lượng nước trong thời gian dài bị thiếu nước. Khi chúng được cho phép uống nước tự do, chúng đã không uống. Chúng đã ăn vài miếng dưa hấu nhỏ, nhưng điều này không thay đổi đáng kể hàm lượng nước trong cơ thể chúng, mà vẫn ở mức 66,3% đến 67,2% trong thời kỳ này...”)

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LQ

Lê Quỳnh Anh

14 tháng 5 2019

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 42. Most desert animals will drink water if confronted with it, but many of them never have any opportunity. All living things must have water, or they will expire. The herbivores find it in desert plants. The carnivores slake their thirst with the flesh and blood of living prey. One of the most remarkable adjustments, however, has been...

Đọc tiếp

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 42.

Most desert animals will drink water if confronted with it, but many of them never have any opportunity. All living things must have water, or they will expire. The herbivores find it in desert plants. The carnivores slake their thirst with the flesh and blood of living prey. One of the most remarkable adjustments, however, has been made by the tiny kangaroo rat, who not only lives without drinking but subsists on a diet of dry seeds containing about 5% free water. Like other animals, he has the ability to manufacture water in his body by a metabolic conversion of carbohydrates. But he is notable for the parsimony with which he conserves his small supply by every possible means, expending only minuscule amounts in his excreta and through evaporation from his respiratory tract.

Investigation into how the kangaroo rat can live without drinking water has involved various experiments with these small animals. Could kangaroo rats somehow store water in their bodies and slowly utilize these resources in the long periods when no free water is available from dew or rain? The simplest way to settle this question was to determine the total water content in the animals to see if it decreases as they are kept for long periods on a dry diet. If they slowly use up their water, the body should become increasingly dehydrated, and if they begin with a store of water, this should be evident from an initial high water content. Results of such experiments with kangaroo rats on dry diets for more than 7 weeks showed that the rats maintained their body weight. There was no trend toward a decrease in water content during the long period of water deprivation. When the kangaroo rats were given free access to water, they did not drink water. They did nibble on small pieces of watermelon, but this did not change appreciably the water itent in their bodies, which remained at 66.3 % to 67.2 % during this period.

This is very close to the water content of dry-fed animals (66.5 %), and the availability of free water, therefore, did not lead to any “storage” that could be meaningful as a water reserve. This makes it reasonable to conclude that physiological storage of water is not a factor in the kangaroo rat’s ability to live on dry food.

The author states that the kangaroo rat is known for all of the following EXCEPT _________.

A. the economy with which it uses available water.

B. living without drinking water.

C. breathing slowly and infrequently.

D. manufacturing water internally.

#Mẫu giáo

1

DH

Dương Hoàn Anh

14 tháng 5 2019

Chọn đáp án C

Tác giả nói rằng chuột túi được biết đến với tất cả các đặc điểm sau NGOẠI TRỪ _________.

A. cách tiết kiệm nước có sẵn

B. sống mà không cần uống nước

C. thở chậm và không thường xuyên

D. tạo nước từ trong cơ thể

Dẫn chứng: One of the most remarkable adjustments, however, has been made by the tiny kangaroo rat, who not only fives without drinking but subsists on a diet of dry seeds containing about 5% free water. Like other animals, he has the ability to manufacture water in his body by a metabolic conversion of carbohydrates. But he is notable for the parsimony with which he congerveshis small supply bv every possible means, expending only minuscule amounts in his excreta and through evaporation from his respiratory tract.

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R

Riin

30 tháng 10 2017 - olm

A plastic can contains 10l of oil.if 1 liter of oil weighs 0.8kg,an tempty can weighs 1.3kg,how much does the can weighs in kilograms?

#Toán lớp 5

1

TH

Thắng Hoàng

30 tháng 10 2017

BẠN ghi bài này vào goolge dịnh người ta khác cho đề tiếng việt rồi bn dải ra rồi ghi vào

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LQ

Lê Quỳnh Anh

11 tháng 4 2018

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 42. Most desert animals will drink water if confronted with it, but many of them never have any opportunity. All living things must have water, or they will expire. The herbivores find it in desert plants. The carnivores slake their thirst with the flesh and blood of living prey. One of the most remarkable adjustments, however, has been...

Đọc tiếp

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 42.

Most desert animals will drink water if confronted with it, but many of them never have any opportunity. All living things must have water, or they will expire. The herbivores find it in desert plants. The carnivores slake their thirst with the flesh and blood of living prey. One of the most remarkable adjustments, however, has been made by the tiny kangaroo rat, who not only lives without drinking but subsists on a diet of dry seeds containing about 5% free water. Like other animals, he has the ability to manufacture water in his body by a metabolic conversion of carbohydrates. But he is notable for the parsimony with which he conserves his small supply by every possible means, expending only minuscule amounts in his excreta and through evaporation from his respiratory tract.

Investigation into how the kangaroo rat can live without drinking water has involved various experiments with these small animals. Could kangaroo rats somehow store water in their bodies and slowly utilize these resources in the long periods when no free water is available from dew or rain? The simplest way to settle this question was to determine the total water content in the animals to see if it decreases as they are kept for long periods on a dry diet. If they slowly use up their water, the body should become increasingly dehydrated, and if they begin with a store of water, this should be evident from an initial high water content. Results of such experiments with kangaroo rats on dry diets for more than 7 weeks showed that the rats maintained their body weight. There was no trend toward a decrease in water content during the long period of water deprivation. When the kangaroo rats were given free access to water, they did not drink water. They did nibble on small pieces of watermelon, but this did not change appreciably the water itent in their bodies, which remained at 66.3 % to 67.2 % during this period.

This is very close to the water content of dry-fed animals (66.5 %), and the availability of free water, therefore, did not lead to any “storage” that could be meaningful as a water reserve. This makes it reasonable to conclude that physiological storage of water is not a factor in the kangaroo rat’s ability to live on dry food.

Which of the following is NOT a source of water for the desert animals?

A. Desert plants

B. Metabolic conversion of carbohydrates in the body

C. The blood of other animals

D. Streams

#Mẫu giáo

1

DH

Dương Hoàn Anh

11 tháng 4 2018

Chọn đáp án D

Cái nào sau đây KHÔNG phải là nguồn nước cho các động vật ở sa mạc?

A. thực vật sa mạc

B. quá trình trao đổi carbohydrates trong cơ thể

C. máu của động vật khác

D. suối

Dẫn chứng: The herbivores find it in desert plants. The carnivores slake their thirst with the flesh and blood of living prey. One of the most remarkable adjustments, however, has been made by the tiny kangaroo rat, who not only lives without drinking but subsists on a diet of dry seeds containing about 5% free water. Like other animals, he has the ability to manufacture water in his body by a metabolic conversion of carbohydrates. (Động vật ăn cỏ tìm thấy nước từ trong thực vật của sa mạc. Loài ăn thịt thỏa mãn cơn khát của chúng bằng máu thịt của con mồi. Tuy nhiên, một trong những sự thích nghi đáng chú ý nhất nằm ở loài chuột túi nhỏ bé. Chúng không chỉ sống mà không cần uống nước. Chúng tồn tại bằng chế độ ăn với hạt khô chứa khoảng 5% nước. Giống như các loài động vật khác, chúng có khả năng sản sinh nước trong cơ thể bằng cách chuyển hóa carbohydrates.)

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LQ

Lê Quỳnh Anh

4 tháng 4 2017

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 42. Most desert animals will drink water if confronted with it, but many of them never have any opportunity. All living things must have water, or they will expire. The herbivores find it in desert plants. The carnivores slake their thirst with the flesh and blood of living prey. One of the most remarkable adjustments, however, has been...

Đọc tiếp

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 42.

Most desert animals will drink water if confronted with it, but many of them never have any opportunity. All living things must have water, or they will expire. The herbivores find it in desert plants. The carnivores slake their thirst with the flesh and blood of living prey. One of the most remarkable adjustments, however, has been made by the tiny kangaroo rat, who not only lives without drinking but subsists on a diet of dry seeds containing about 5% free water. Like other animals, he has the ability to manufacture water in his body by a metabolic conversion of carbohydrates. But he is notable for the parsimony with which he conserves his small supply by every possible means, expending only minuscule amounts in his excreta and through evaporation from his respiratory tract.

Investigation into how the kangaroo rat can live without drinking water has involved various experiments with these small animals. Could kangaroo rats somehow store water in their bodies and slowly utilize these resources in the long periods when no free water is available from dew or rain? The simplest way to settle this question was to determine the total water content in the animals to see if it decreases as they are kept for long periods on a dry diet. If they slowly use up their water, the body should become increasingly dehydrated, and if they begin with a store of water, this should be evident from an initial high water content. Results of such experiments with kangaroo rats on dry diets for more than 7 weeks showed that the rats maintained their body weight. There was no trend toward a decrease in water content during the long period of water deprivation. When the kangaroo rats were given free access to water, they did not drink water. They did nibble on small pieces of watermelon, but this did not change appreciably the water itent in their bodies, which remained at 66.3 % to 67.2 % during this period.

This is very close to the water content of dry-fed animals (66.5 %), and the availability of free water, therefore, did not lead to any “storage” that could be meaningful as a water reserve. This makes it reasonable to conclude that physiological storage of water is not a factor in the kangaroo rat’s ability to live on dry food.

What is the topic of this passage?

A. Kangaroo rats

B. Water in the desert

C. Desert life

D. Physiological experiments

#Mẫu giáo

1

DH

Dương Hoàn Anh

4 tháng 4 2017

Chọn đáp án A

Chủ đề cùa bài đọc là gì?

A. loài chuột túi

B. nước ở sa mạc

C. đời sống sa mạc

D. thí nghiệm sinh lý

Dẫn chứng: - One of the most remarkable adjustments, however, has been made by the tiny kangaroo rat, who not only lives without drinking but subsists on a diet of dry seeds containing about 5% free water... (Tuy nhiên, một trong những điều chỉnh đáng chú ý nhất, đã được thực hiện bởi chuột kangaroo nhỏ, chúng không chỉ sống mà không uống nhưng trong chế độ ăn uống của chúng những hạt khô chứa khoảng 5% nước trong đó)

- Investigation into how the kangaroo rat can live without drinking water has involved various experiments with these small animals...

Cả bài đọc này chủ yếu thảo luận về loài chuột túi.

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LQ

Lê Quỳnh Anh

7 tháng 6 2018

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 42. Most desert animals will drink water if confronted with it, but many of them never have any opportunity. All living things must have water, or they will expire. The herbivores find it in desert plants. The carnivores slake their thirst with the flesh and blood of living prey. One of the most remarkable adjustments, however, has been...

Đọc tiếp

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 42.

Most desert animals will drink water if confronted with it, but many of them never have any opportunity. All living things must have water, or they will expire. The herbivores find it in desert plants. The carnivores slake their thirst with the flesh and blood of living prey. One of the most remarkable adjustments, however, has been made by the tiny kangaroo rat, who not only lives without drinking but subsists on a diet of dry seeds containing about 5% free water. Like other animals, he has the ability to manufacture water in his body by a metabolic conversion of carbohydrates. But he is notable for the parsimony with which he conserves his small supply by every possible means, expending only minuscule amounts in his excreta and through evaporation from his respiratory tract.

Investigation into how the kangaroo rat can live without drinking water has involved various experiments with these small animals. Could kangaroo rats somehow store water in their bodies and slowly utilize these resources in the long periods when no free water is available from dew or rain? The simplest way to settle this question was to determine the total water content in the animals to see if it decreases as they are kept for long periods on a dry diet. If they slowly use up their water, the body should become increasingly dehydrated, and if they begin with a store of water, this should be evident from an initial high water content. Results of such experiments with kangaroo rats on dry diets for more than 7 weeks showed that the rats maintained their body weight. There was no trend toward a decrease in water content during the long period of water deprivation. When the kangaroo rats were given free access to water, they did not drink water. They did nibble on small pieces of watermelon, but this did not change appreciably the water itent in their bodies, which remained at 66.3 % to 67.2 % during this period.

This is very close to the water content of dry-fed animals (66.5 %), and the availability of free water, therefore, did not lead to any “storage” that could be meaningful as a water reserve. This makes it reasonable to conclude that physiological storage of water is not a factor in the kangaroo rat’s ability to live on dry food.

The word “expire” in paragraph 2 is closest in meaning to _________.

A. become ill

B. die

C. shrink

D. dehydrate

#Mẫu giáo

1

DH

Dương Hoàn Anh

7 tháng 6 2018

Chọn đáp án B

- become ill: trở nên ốm yếu

- die: chết

- shrink: co lại, rút lại

- dehydrate: hút nước, khử nước

“Most desert animals will drink water if confronted with it, but many of them never have any opportunity. All living things must have water, or they will expire”. (Hầu hết các loài động vật trên sa mạc sẽ uống nước nếu gặp được nước, nhưng nhiều loài chưa bao giờ có cơ hội. Tất cả các sinh vật sống phải có nước hoặc chúng sẽ chết.)

Do đó: expire ~ die

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LQ

Lê Quỳnh Anh

22 tháng 11 2017

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 42. Most desert animals will drink water if confronted with it, but many of them never have any opportunity. All living things must have water, or they will expire. The herbivores find it in desert plants. The carnivores slake their thirst with the flesh and blood of living prey. One of the most remarkable adjustments, however, has been...

Đọc tiếp

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 42.

Most desert animals will drink water if confronted with it, but many of them never have any opportunity. All living things must have water, or they will expire. The herbivores find it in desert plants. The carnivores slake their thirst with the flesh and blood of living prey. One of the most remarkable adjustments, however, has been made by the tiny kangaroo rat, who not only lives without drinking but subsists on a diet of dry seeds containing about 5% free water. Like other animals, he has the ability to manufacture water in his body by a metabolic conversion of carbohydrates. But he is notable for the parsimony with which he conserves his small supply by every possible means, expending only minuscule amounts in his excreta and through evaporation from his respiratory tract.

Investigation into how the kangaroo rat can live without drinking water has involved various experiments with these small animals. Could kangaroo rats somehow store water in their bodies and slowly utilize these resources in the long periods when no free water is available from dew or rain? The simplest way to settle this question was to determine the total water content in the animals to see if it decreases as they are kept for long periods on a dry diet. If they slowly use up their water, the body should become increasingly dehydrated, and if they begin with a store of water, this should be evident from an initial high water content. Results of such experiments with kangaroo rats on dry diets for more than 7 weeks showed that the rats maintained their body weight. There was no trend toward a decrease in water content during the long period of water deprivation. When the kangaroo rats were given free access to water, they did not drink water. They did nibble on small pieces of watermelon, but this did not change appreciably the water itent in their bodies, which remained at 66.3 % to 67.2 % during this period.

This is very close to the water content of dry-fed animals (66.5 %), and the availability of free water, therefore, did not lead to any “storage” that could be meaningful as a water reserve. This makes it reasonable to conclude that physiological storage of water is not a factor in the kangaroo rat’s ability to live on dry food.

The word “parsimony” in paragraph 1 is closest in meaning to _________.

A. intelligence

B. desire

C. frugality

D. skill

#Mẫu giáo

1

DH

Dương Hoàn Anh

22 tháng 11 2017

Chọn đáp án C

- intelligence (n): sự thông minh

- desire (n): sự mong muốn, khát khao

- frugality (n): tính tiết kiệm

- skill (n): kĩ năng

“But he is notable for the parsimony with which he conserves his small supply by every possible means, expending only minuscule amounts in his excreta and through evaporation from his respiratory tract.” (Nhưng nó nổi tiếng với tính tiết kiệm qua việc bảo tồn nguồn cung cấp nhỏ bé của mình bằng mọi cách có thể, chỉ dùng hết lượng rất nhỏ trong chất bài tiết và qua quá trình bay hơi từ đường hô hấp)

Do đó: parsimony ~ frugality

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