If necessary,a doctor may prescribe tranquillizers or sleeping pills.Take only the dosage he prescribes;any more is dangerous.
5.According to the writer,insomnia is ________.
A.a rare problem
B.a sign of illness
C.a common complaint
D.a modern disease
解析:选C。细节理解题。依据文章第一段第二句“It is a problem to nearly everyone at some time.”可知失眠是一种常见疾病,C项正确。
6.Which of the following statements is NOT the cause of insomnia?
A.Too many blankets on a hot night.
B.Drinking juice.
C.Emotional or mental disorders.
D.Physical pain.
解析:选B。细节理解题。文章第二段和第三段分析了失眠的原因,其中之一是喝了提神的饮品(茶、咖啡等),但没有提及喝果汁影响睡眠。其他三项在文中均有提及。
7.Insomnia needn’t be taken seriously because ________.
A.people can catch on sleep during the day
B.many people sleep far too much
C.it can easily be cured by doctors
D.it is cured naturally by tiredness
解析:选D。细节理解题。依据文章倒数第二段的“Above all,he...asleep.”可知,当一个人特别疲惫时就能睡着,所以不需要担心。
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