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  3. The popular notion that older people need less sleep than younger adults is a myth, scientists said yesterday. While elderly

The popular notion that older people need less sleep than younger adults is a myth, scientists said yesterday. While elderly

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问题    The popular notion that older people need less sleep than younger adults is a myth, scientists said yesterday.
   While elderly people【C1】______to sleep for fewer hours than they did when they were younger, this has a(n) 【C2】______ effect on their brain’ s performance and they would benefit from getting more, according to research.
   Sean Drummond, a psychiatrist (心理医生) at the University of California, San Diego, said older people are more likely to suffer from broken 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, he said.
   "The ability to sleep in one chunk (整段时间) overnight goes down as we age but the amount of sleep we need to【C6】______well does not change," Dr. Drummond told the American Association for the Advancement of Science conference in San Diego.
   "It’s【C7】______a myth that older people need less sleep. The more healthy an older adult is, the more they sleep like they did when they were【C8】______. Our data suggests that older adults would benefit from 【C9】______ to get as much sleep as they did in their 30s. That’ s【C10】______from person to person, but the amount of sleep we had at 35 is probably the same amount as we need at 75."
   A) alert B) associated C) attracting D) cling
   E) continuing F) definitely G) different H) efficiently
   I) formally J) function K) mixed L) negative
   M) sufficient N) tend O) younger
【C1】
选项
答案N
解析 分析句子可知此处需要一个动词，又根据前面的复数名词people可知这里要填动词原形，选项中符合的有tend和cling，只有tend符合题意，意为老年人趋向于睡得时间少
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