Questions 1 to 3 are based on the passage you have just heard。A.The importance of sleep to

Questions 1 to 3 are based on the passage you have just heard。

A.The importance of sleep to a healthy life。

B.Reasons for Americans’ decline in sleep。

C.Some tips to improve the quality of sleep。

D.Diseases associated with lack of sleep。

请帮忙给出正确答案和分析，谢谢！

参考答案

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