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听下面一段对话,回答下列各小题。

1.Why does David study seep?

A.Because sleep is important. B.Because sleep is a hot topic. C.Because people can't sleep well.

2.How long does a police officer often work?

A.For ten hours. B.For eleven hours. C.For twelve hours.

3.How does David study sleep?

A.By asking questions. B.By reading articles. C.By doing the experiments (实验).

4.What can we know from the conversation?

A.People can always sleep well after tiring work. B.Blue light may be good for tired people at work.

C.Scientists study sleep by using different music.

九年级英语听长对话回答问题中等难度题

少年,再来一题如何?
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