2. 外语
  3. Judging from recent surveys, most experts in sleep behavior agree that there is virtually an epidemic of sleepiness in the natio

Judging from recent surveys, most experts in sleep behavior agree that there is virtually an epidemic of sleepiness in the natio

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问题      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 【C1】______  sleep than they ought to." says Dr. David. 【C2】______  people who think they are Sleeping enough would probably be better 【C3】______  with more rest.
     The beginning of our sleep deficit crisis can be 【C4】______  to the invention of the light bulb a century ago. From diary entries and other personal 【C5】______  from the 18th and 19th centuries, sleep scientists have reached the 【C6】______  that the average person used to sleep about 9.5 hours a night. "The best sleep habits once were 【C7】______  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 【C8】______ , 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 【C9】______  they’re doing it," says Dr. David. "They think they’re okay because they can get 【C10】______  on 6.5 hours, when they really need 7.5, 8 or even more to feel ideally 【C11】______  "
   Perhaps the most merciless robber of sleep, researchers say, is the 【C12】______  of the day. Whenever pressures from work, family, friends and community 【C13】______ , many people consider sleep the least 【C14】______  item on the agenda. "In our soci-ety, you’re considered 【C15】______  it’ you say you only need 5.5 hours’ sleep. If yon say you’ve got to get 8.5 hours, people think you lack 【C16】______  and ambition."
     To assess the 【C17】______  of sleep deficit, researchers have put subjects 【C18】______  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 sleep-deprived, performance 【C19】______ ," says Dr. David. "Short-term memory is impaired, 【C20】______  are abilities to make decisions and to concentrate."   
【C4】
选项 A、followed
B、trailed
C、tracked
D、traced
答案D
解析 形近动词辨义题。由“初现睡眠不足”和“一世纪前发明了电灯”，可知此处在探寻睡眠不足的原因。trace“追溯……的发展”符合旬意。形近词trail表示“拖，拉；跟踪”，track“追踪，跟踪”。  
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