历年四级阅读理解A.doc

（11年6月）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 brains 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. “Its __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. Thats __56__ 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 I) formally B) associated J) function C) attracting K) mixed D) cling L) negative E) continuing M) sufficient F) definitely N) tend G) different O) younger (10年12月)What determines the kind of person you are? What factors make you more or less bold, intelligent, or able to read a map? All of these are influenced by the interaction of your genes and the environment in which you were 47 . The study of how genes and environment interact to influence 48 activity is known as behavioral genetics. Behavioral genetics has made important 49 to the biological revolution, providing information about the extent to which biology influences mind, brain