单选题
The popular notion that older people need less sleep than younger adults is a myth, scientists said yesterday. While elderly people 25 to sleep for fewer hours than they did when they were younger, this has a(n) 26 effect on their brain's performance and they would benefit from getting more, according to research. Scan Drummond, a psychiatrist (生理医生) at the University of California, San Diego, said that older people are more likely to suffer from broken sleep, while younger people are better at sleeping 27 straight through the night. More sleep in old age, however, is 28 with better health, and most older people would feel better and more 29 if they slept for longer periods, he said. 'The ability to sleep in one chunk (整块时间) overnight goes down as we age but the amount of sleep we need to 30 well does not change, ' Dr Drummond told the American Association for the Advancement of Science conference in San Diego. 'It's 31 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 32 . Our data suggests that older adults would benefit from 33 to get as much sleep as they did in their 30s. That's 34 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