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单选题
According to the author, sleeping habits ______.
A
are related to the amount of sleep
B
are inherited from the parents
C
vary from person to person
D
would not change in one’s lifetime
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参考解析
解析：
文章首段提到Dr. A. Burton认为如果睡眠充足，人们应该在闹钟响前五分钟醒来，并且感到精神抖擞、思维敏捷。而作者却不以为然，认为有些人比其他人惰性大（greater inertia），他们在该睡觉时兴奋，但到该起床时感到困，这与他们应睡多长时间无关，由此可见作者认为睡眠习惯因人而异。故D项正确。
文章首段提到Dr. A. Burton认为如果睡眠充足，人们应该在闹钟响前五分钟醒来，并且感到精神抖擞、思维敏捷。而作者却不以为然，认为有些人比其他人惰性大（greater inertia），他们在该睡觉时兴奋，但到该起床时感到困，这与他们应睡多长时间无关，由此可见作者认为睡眠习惯因人而异。故D项正确。
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