听力音频：
Questions 31-40
Complete the notes below.
Write NO MORE THAN TWO WORDS for each answer.
The role of sleep in humans and animals
Importance of sleep in animals
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Compared to those without food, animals without sleep are more likely to suffer from 31………………..
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Sleep is necessary for all animals, whether they are reptiles, 32……………….. or fish.
Differences in animals’ sleep and reasons for their ways of resting
Dolphins
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swim to the surface when sleeping, because they need to 33………………..
Birds
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are constantly 34……………….. in the presence of numerous predators.
Horses
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do most of their sleeping standing up.
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do occasionally take short naps lying down.
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Lying in one position for a long time could well injure a horse, because their 35……………….. are delicate.
Potential problems encountering
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Animals can also have 36……………….., the same as humans.
Importance of sleep in humans
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It helps us to organise our 37……………….. of the day.
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It plays a key role in 38………………..
e.g.
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Because of the similar sleeping pattern to that in humans, 39……………….. are studied in order to increase our knowledge of human physiology.
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Scientists choose to study the 40……………….. of the fruit fly in order to know the function of the human gene and understand developmental processes in humans.
答案
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