2019屆高考英語總復習名師全程導學案：Unit4 名師點津
the beginning of our sleepdeficit crisis can be traced back to the invention of the light bulb a century ago. from diary entries and our 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, the 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 in 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 or even more to feel ideally energetic. ”
perhaps the most merciless robber of sleep, researches say, is the complexity of the day. whenever pressures from work, family, friends and community increase, many people consider sleep the least expensive item on their programme. “in our society, you’re considered dynamic if you say you need only 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 sleepdeficit, 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 sleepdeficit, performance suffers，”says dr david. “shortterm memory is weakened, as are abilities to make decisions and to concentrate. ”
【解題導語】 本文圍繞睡眠不足的原因及后果展開討論。
6. what is the main topic of the passage?
a. research on the causes and consequences of sleepdeficit.
b. the epidemic of sleepiness in the modern times.
c. the history of people’s sleeping patterns.
d. the minimum of our sleeping hours.
解析：選a。主旨大意題。整篇文章都是對睡眠不足的原因和結果的調(diào)查，故選a。另外，通過排除法，也可得出答案為a。
7. which of the following is dr david’s opinion?
a. people who think they are sleeping enough are better off than those who don’t.
b. some people can remain energetic with only 6. 5 hours’ sleep a night.
c. if they get 8. 5 hours’sleep，people will be full of drive and ambition.
d. people’s mental power suffers if they are lacking in sleep.
解析：選d。細節(jié)理解題。從最后一段的“‘we’ve found that if you’re in sleepdeficit，performance suffers，’says dr david”我們可知答案應為d。