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

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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