Questions 47 to 56 are based on the following passage.

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

　　While elderly people __47__ to sleep for fewer hours than they did when they were younger, this has a(n) __48__ 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 __49__ straight through the night.

　　More sleep in old age, however, is __50__ with better health, and most older people would feel better and more __51__ 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 __52__ well does not change,” Dr Drummond told the American Association for the Advancement of Science conference in San Diego.

　　“It's __53__ 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 __54__. Our data suggests that older adults would benefit from __55__ to get as much sleep as they did in their 30s. That's __56__ from person to person, but the amount of sleep we had at 35 is probably the same amount as we need at 75.”

　　注意：此部分试题请在答题卡2上作答。

　　答案

　　47 N tend 48 L negative 49 H efficiently 50 B associated

　　51 A alert 52 J function/ 53 F definitely 54 O younger

　　55 E continuing56 G different

　　文章大意：本文主要讲述的是关于老年人睡眠的问题：是否老年人与年轻人相比只需要较少的睡眠时间?