According to the National Sleep Organization, how long should adults sleep a night? The National Sleep Organization found many

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问题 According to the National Sleep Organization, how long should adults sleep a night?
The National Sleep Organization found many Japanese sleep poorly by ______.

选项 A、telephoning them
B、communicating with them face to face
C、using the Internet
D、asking their doctors

答案A

解析 根据第三段第一句“Of the 1,506 adults interviewed over telephone between...”可以得知:是通过电话对人们进行的采访才发现人们的睡眠问题。故答案为D。
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