历年英语四级考试的阅读理解部分5_大学英语阅读

　　21. The author uses the example of the robot in space exploration to tell us ______.

　　the differences between robots and men about the need for robots to save power

　　the reason why men need to sleep about the danger of men working at night

　　22. Evolution has programmed man to sleep at night chiefly to help him ______.

　　maintain a regular pattern of life avoid danger and inefficient labor

　　prevent trouble that comes looking for him restore his bodily functions

　　23.According to the author, we cannot sleep well when we _____.

　　are worrying about our safety are in a tent

　　are overworked are away from home

　　24.Cats sleep much more than horses do partly because cats _____.

　　need more time for restoration

　　are unlikely to be attackers

　　are more active than horses when they are awake

　　spend less time eating to get enough energy

　　25.Which of the following is the main idea of the passage? ______.

　　Evolution has equipped all creatures with a regular pattern of sleeping and waking.

　　The study of sleep is an important part of the evolutionary theory.

　　Sleeping patterns must be taken into consideration in the designing of robots.

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