Text 2 Judging from recent surveys, most experts in sleep behavior agree that there is virtually an epidemic of sleepiness in the nation. "I can’t think of a single study that hasn’t found Americans getting less sleep than they ought to," says Dr David. Even people who think they are sleeping enough would probably be better off with more rest. The beginning of our sleep-deficit crisis can be traced to the invention of the light bulb a century ago. From diary entries and other personal accounts from the 18th and 19th centuries, sleep scientists have reached the conclusion that the average person used to sleep about 9. 5 hours a night. "The best sleep habits once were forced on us, when we had nothing to do in the evening down on the farm, and it was dark." By the 1950s and 1960s, that sleep schedule had been reduced dramatically, to between 7.5 and 8 hours, and most people had to wake to an alarm clock. "People cheat on their sleep, and they don’t even realize they’re doing it," says Dr David. "They think they’re okay because they can get by on 6.5 hours, when they really need 7.5, 8 hours or even more to feel ideally vigorous." Perhaps the most merciless rubber of sleep, researchers say, is the complexity of the day. When ever pressures from work, family, friends and community mount, many people consider sleep the least expensive item on his programme. "In our society, you’re considered dynamic if you say you only need 5.5 hours’ sleep. If you’ve got to get 8.5 hours, people think you lack drive and ambition." To determine the consequences of sleep deficit, researchers have put subjects through a set of psychological and performance tests requiring them, for instance, to add columns of numbers or recall a passage read to them only minutes earlier. "We’ve found that if you’re in sleep deficit, performance suffers," says Dr David. "Short-term memory is weakened, as are abilities to make decisions and to concentrate." According to Dr David, Americans ______.
A. are ideally vigorous even under the pressure of life
B. often neglect the consequences of sleep deficit
C. do not know how to relax themselves properly
D. can get by on 6. 5 hours of sleep
根据以下资料回答86-90题。根据全国第二次农业普查资料,2006年末,浙江实有耕地面积为1594.43千公顷,分别比1980年、1985年、1990年、1996年、2000年减少12.5%、10.3%、7.5%、1.2%和0.8%,其中水田面积为1291.08千公顷,分别比1980年、1985年、1990年、1996年、2000年减少12.0%、10.5%、9.7%、4.0%、2.8%。随着第二、三产业发展,农民剩余劳动力转移,收入途径拓宽。与此同时,浙江农民人均土地逐年减少,农民经营农业规模不断缩小,收益相对下降,农民对农业经营投入下降。但多数农民身份没变,不敢完全放弃对承包到户土地的控制权,仍将土地看做家庭生存的保障之一,使浙江农业成为多数农户的副业,导致经营农业规模不断缩小、效益下降。2006年,浙江农村居民人均纯收入为7335元,1996-2006年各年份保持不同程度的增长,年平均实际增长6.8%。2006年,浙江人均耕地面积为0.034公顷,比1980年下降28.2%。农民经营农业收入占人均纯收入的比重从1985年的37.3%下降到2006年的12.0%。农业生产户数为808.26万户,占农村住户数的66.2%,比2003年下降14.5个百分点,其中:纯农户所占比重为19.5%,非农业兼业户达60.1%。2006年,浙江牧业总产值为287.34亿元,占全省农、林、牧、渔业总产值的19.0%;1996-2006年年均增长为4.4%,比全省农、林、牧、渔业总产值年均增长高1.1个百分点;农民纯收入中,牧业的农民家庭经营收入为281元,占家庭经营收入的9.3%,1996-2006年的年均增长为2.0%,分别比第二、三产业的经营收入的年增长率低8.8和8.0个百分点。在先发优势不断减弱的情况下,农村的第二、三产业发展难度加大,农民经营非农产业的收入增长趋缓。浙江农民工资性收入与家庭经营非农产业收入在农民纯收入中占有高比重。农村的第二、三产业发展是构成浙江农民工资性收入和家庭经营非农产业收入的主要来源。随着市场经济发展,要素资源不断匮乏,并向大企业倾斜,非农产业的创业成本不断提高。与农民收入关系紧密的农村第二、三产业发展趋缓,导致农民工资性收入和家庭经营非农产业收入增长趋缓。从浙江个体工业单位发展情况看,2007年单位数为67.5万户,2001-2007年年均增长2.8%。 下列各项,数值最小的是()。
A. 1985年比2006年的实有耕地面积多的百分比
B. 2003年农业生产户数占农村住户数的比重
C. 第二产业经营收入的年增长率
D. 2001-2007年个体工业单位年均增长率