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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
【C7】
选项
答案F
解析 分析句子成分得出此句不缺成分，可以猜测这里应该是一个表强调语气的副词，作者在前面也提到了这是一个myth，可以肯定这里是在强调，在选项中的副词中只有definitely符合题意。故选F。
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