单项选择题

①你的面前有两个门，左门和右门，你必须在它们之间选择
②这里我们不考虑道德因素，你将如何选择
③这时候，屋里突然失火，火势很大，无法扑灭，此时你想逃生
④但问题是，其他人也要争抢这两个门出逃
⑤一天晚上，你参加一个派对，屋里有很多人，你玩得很开心
⑥如果你选择的门是很多人选择的，那么你将因人多拥挤、冲不出去而烧死
⑦相反，如果你选择的是较少人选择的，那么你将逃生排列组合最连贯的是（）。

A．⑤③①⑥⑦②④
B．⑤①④③②⑦⑥
C．⑤③②①④⑥⑦
D．⑦⑥①④③②⑤

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【案例分析题】No one knows exactly why we sleep.But scientists have learned a lot about how we sleep，From sleep experiments，scientists have learned that there are four different stages of sleep. When you first fall asleep，your heart starts to beat more slowly and your breathing slows down.If something wakes you，you might not think that you had been asleep.Some people call this kind of sleep dozing.Scientists call it Stage One sleep.Next，if you are not awakened，you drift into a deeper sleep.Your pulse and breathing become even slower than they were during Stage One sleep.But you can still be awakened quite easily.If you take a cat nap，you probably will not get any further than this stage of sleep，which is called Stage Two. If you sleep longer than about twenty minutes，you go into the third stage of sleep.Your body is very relaxed.It would take a loud noise to wake you up. You have probably heard of people who walk in their sleep.No one knows what makes people sleepwalk.But a person can sleepwalk only during Stage Four.This is the deepest kind of sleep.If someone wakes you up during stage four，you might feel very confused.It might take you a few minutes to get used to being awake.What's the topic of the passage?（）

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