题目:
Suppose we built a robot to explore the planet Mars. We provide the robot with seeing detectors to keep it away from danger. It is powered entirely by the sun. Should we program the robot to be equally active at all times No, the robot would be using up energy at a time when it was not receiving any. So we would probably program it to stop its activity at night and to wake up at dawn the next morning.
According to evolutionary theory of sleep, evolution equipped us with a regular pattern of sleeping and waking for the same reason. The theory does not deny that sleep provides some important restorative functions. It merely says that evolution has programmed us to perform those functions at a time when activity would be inefficient and possibly dangerous. However, sleep protects us only from the sort of trouble we might walk into; it does not protect us from trouble that comes looking for us. So we sleep well when we are in a familiar, safe place, but we sleep lightly, if at all, when we fear that bears will nose into the tent.
The evolutionary theory explain the differences in sleep among creatures. Why do cats, for instance, sleep so much, while horses sleep so little Surely cats do not need five times as much repair and restoration as horses do. But cats can afford to have long periods of inactivity because they spend little time eating and are unlikely to be attacked while they sleep. Horses must spend almost all their waking hours eating, because what they eat is very low in energy value. Moreover, they cannot afford to sleep too long or too deeply, because their survival depends on their ability to run away from attackers.
Evolution has programmed man to sleep at night chiefly to help him ______.
A. keep up a regular pattern of life
B. prevent trouble that comes looking for him
C. avoid danger and inefficient labor
D. restore his bodily functions
答案:
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参考答案:疟伤胃阳,气逆不降,热劫胃液,不饥不饱,不食不便,渴不欲饮,味变酸浊。解析:加减人参泻心汤【来源】《温病条辨》卷二。【组成】人参6克黄连4.5克枳实3克干姜4.5克生姜6克牡蛎6克【用法】用水500毫...