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  3. （英语类学生必做） Sleep is important to us because it helps restore organs and tissues in our body. But how much sleep do we actuall

（英语类学生必做） Sleep is important to us because it helps restore organs and tissues in our body. But how much sleep do we actuall

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问题 （英语类学生必做）
    Sleep is important to us because it helps restore organs and tissues in our body. But how much sleep do we actually need?
    For most of us, eight hours seems to be about the right amount. Yet we know that there are many people who get 【61】 perfectly with less sleep, and some who may need 【62】 A great deal depends on the 【63】 we live. But a good general rule 【64】 is to sleep as long as we have to in order to feel happy and be able to work 【65】 our best when we awaken.
    There are actually different 【66】 of sleep. There is a deep sleep and a shallow sleep. In a shallow sleep our body does not get the same kind of rest it gets in a 【67】 sleep, 【68】 after eight hours of a shallow sleep we may still feel tired. But a short, deep sleep can be very 【69】 Alexander—the Great Emperor was able to get a deep sleep 【70】 he needed it. Once, during the night before an important battle, he remained 【71】 longer than anyone else. 【72】 he wrapped himself in a cloak and 【73】 down on the earth. He slept so 【74】 that his generals had to wake him three times for him to give the 【75】 to attack!
    Normally when we go to sleep, our " sleep center" blocks off nerves so that 【76】 our brain and body go to sleep. 【77】 prevents us from wanting to do anything, and the other 【78】 our internal organs and limbs go to sleep. 【79】 sometimes only one goes to sleep and the other does not. A very tired soldier can sometimes 【80】 asleep (brain sleep) and keep on marching, because his body is not asleep.
选项 A、So
B、Thus
C、Or
D、But
答案D
解析 前一句意思是：睡眠中枢和神经使得我们不想做任何事情，同时也促使内脏和四肢进入睡眠状态。而本句讲的是，有时候只有大脑休息，而四肢没有休息到。故意思是相反的，是转折关系；而so和thus是因果关系的转折连词，or则表示选择关系的“或者”，或是“否则”的意思。
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