21. The author uses the example of the robot in space exploration to tell us ________.
A) the differences between robots and men
B) the reason why men need to sleep
C) about the need for robots to save power
D) about the danger of men working at night
22. Evolution has programmed man to sleep at night chiefly to help him ________.
A) maintain a regular pattern of life
B) prevent trouble that comes looking for him
C) avoid danger and inefficient labour
D) restore his bodily functions
23. According to the author, we cannot sleep well when we ________.
A) are worrying about our safety C) are in a tent
B) are overworked D) are away from home
24. Cats sleep much more than horses do partly because cats ________.
A) need more time for restoration
B) are unlikely to be attackers
C) are more active than horses when they are awake
D) spend less time eating to get enough energy
25. Which of the following is the main idea of the passage?
A) Evolution has equipped all creatures with a regular pattern of sleeping and waking.
B) The study of sleep is an important part of the evolutionary theory.
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