It can be inferred from the passage that______. A.people can improve their sleeping if they sleep more hours than usual B.in order to sleep more soundly at night, people can take a nap at noon C.the nine-step treatment for insomniacs was developed by Arthur Spielman D.approximately 15 percent of the people are suffering insomnia
A.A.people B.in C.the D.approximately
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D 解析：本题是一道暗示引申类题目。问我们可以从文章中推断出什么。针对所给的四个选项，利用查阅式阅读法，结合原文......