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

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 43 to 50.

While most desert animals will drink water if confronted with it, for many of them the opportunity never comes. Yet 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 content 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.

(Adapted from A TOEFL Practice tests)

Câu 420710: It is implied by the author that desert animals can exist with little or no water because of _____.

A. many opportunities for them to find water.

B. their ability to eat plants.

C. less need for water than other animals.

D. their ability to adjust to the desert environment.

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Câu hỏi : 420710

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Phương pháp giải:

Kiến thức: Đọc hiểu – suy luận

Đáp án : D
(0) bình luận (0) lời giải
Giải chi tiết:
Tác giả ngụ ý rằng động vật sa mạc có thể tồn tại với rất ít hoặc không có nước vì ______.

A. nhiều cơ hội để chúng tìm nước.

B. khả năng ăn thực vật của chúng.

C. ít cần nước hơn các động vật khác.

D. khả năng thích nghi với môi trường sa mạc.

Thông tin: The herbivores find in desert plants. The carnivores slake their thirst with the flesh and blood of living prey.

Tạm dịch: Các động vật ăn cỏ tìm thấy nước trong thực vật sa mạc. Động vật ăn thịt làm dịu cơn khát với thịt và máu của con mồi.

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