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亚里士多德的伦理学一是探讨人的灵魂的整全性，二是探讨城邦的善。所以，他的伦理学就是探讨城邦生活的哲学，是基于城邦生活说话的，他的伦理学是具有政治学意义的科学。（    ）
A、正确
B、错误

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单项选择题
Researchers have found that REM（rapid eye movement）sleep is important to human beings. This type of sleep generally occurs four or five times during one night of sleep lasting five minutes to forty minutes for each occurrence. The deeper a person's sleep becomes, the longer the periods of rapid eye movement.
There are physical charges in the body to show that a person has changed from NREM（non-rapid eye movement）to REM sleep. Breathing becomes faster, the heart rate increases, and, as the name implies, the eyes begin to move quickly.
Accompanying these physical changes in the body is a very important characteristic of REM sleep. It is during REM sleep that a person dreams.
The subject of this passage is ____.（　　
A.whypeoplesleep
B.thehumanneedforREMsleep
C.thecharacteristicofREMsleep
D.physicalchangesinthehumanbody
单项选择题
虚函数有继承性，基类中说明的虚函数只要在它的派生类中函数原型完全一致，一定是虚函数。
A、正确
B、错误
单项选择题
Researchers have found that REM（rapid eye movement）sleep is important to human beings. This type of sleep generally occurs four or five times during one night of sleep lasting five minutes to forty minutes for each occurrence. The deeper a person's sleep becomes, the longer the periods of rapid eye movement.
There are physical charges in the body to show that a person has changed from NREM（non-rapid eye movement）to REM sleep. Breathing becomes faster, the heart rate increases, and, as the name implies, the eyes begin to move quickly.
Accompanying these physical changes in the body is a very important characteristic of REM sleep. It is during REM sleep that a person dreams.
According to the passage, how often does REM sleep occur in one night?（　　）
A.once
B.twice
C.fouroffivetimes
D.fortytimes
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