According to the National Sleep Organization, how long should adults sleep a night? The main idea of this passage is ______.

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问题 According to the National Sleep Organization, how long should adults sleep a night?
The main idea of this passage is ______.

选项 A、why Japanese have sleep problems
B、how to deal with sleep problems
C、that many Japanese sleep poorly
D、how to sleep well

答案C

解析 根据全篇文章的含义可以得知本文主要讲述的是日本人的睡眠比较差。故答案为C。
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