The popular notion that older people need less sleep than younger adults is a myth, scientists reported on a well-acknowledged p

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问题 The popular notion that older people need less sleep than younger adults is a myth, scientists reported on a well-acknowledged periodical yesterday.
While elderly people【C1】______to sleep for fewer hours than they did when they were younger, this has a negative effect on their brain’s performance and they would benefit from getting more, according to the research.
Sean Drummond, a psychiatrist at the University of California, San Diego, said older people are more likely to suffer from【C2】______sleep, while younger people are better at sleeping【C3】______straight through the night. More sleep in old age, however, is【C4】______with better health, and most older people would feel better and more【C5】______if they slept for longer periods instead of the four or five hours per night, he said.
"The ability to sleep in one chunk overnight goes down as we【C6】______but the amount of sleep we need to【C7】______well does not change," Dr. Drummond told the American Association for the Advancement of Science conference in San Diego.
"It’s【C8】______a myth that older people need less sleep. The healthier an older adult is, the more they sleep like they did when they were younger. Our data suggests that older adults would【C9】______from continuing to get as much sleep as they did in their 30s. That’s different from person to person, but the amount of sleep we had at 35 is【C10】______the same amount as we need at 75."
A. alert B. associated C. function D. negative
E. age F. definitely G. probably H. intend
I. benefit J. efficiently K. tend L. effectively
M. broken N. smart O. behave
【C2】

选项

答案M

解析 broken,上下文题。根据词性,此处应当填入形容词。根据下文“while younger people are better at sleeping 3 straight through the night.”司见年轻人可以一觉到天明,以此推测老年人正相反,睡眠断断续续,故选broken。
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