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单选题

Question 17 is based on the passage you have just heard.

A
They are more health-conscious.
B
They are changing their living habits.
C
They get less and less sleep.
D
They know the dangers of lack of sleep.
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答案：

C

解析：

17. What do we learn from the talk about today’s Americans?

解析:文章开头部分提到了关于睡眠时间减少的趋势，接着说很多美国人的健康等受到了威胁，原文中的内容The massive decline in sleep happened so slowly对应选项中的They get less and less sleep, 故答案选C)。

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