Sleep problems can seriously affect one’s quality of life. The causes of sleep problems in older people remain unidentified.

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问题 Sleep problems can seriously affect one’s quality of life.
The causes of sleep problems in older people remain unidentified.

选项 A、Right
B、Wrong
C、Not mentioned

答案B

解析 短文的第八段对老年人睡眠问题的起因进行了分析,主要与各种急、慢性病相关。
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