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17.[1]Medical research is leading American education officials to consider having high school classes start later in the morning.The research says that teenagers are more awake later at night than adults are.When staying up late at night,the teenagers have problems learning early in the morning.
[2]Researchers in the state of Rhode Island measured the amount of the hormone(荷尔蒙) melatonin(降黑素) in people's mouths at different times of the day.Melatonin causes people to feel sleepy.
[3]They found that melatonin levels rise later at night in teenagers than they do in children and adults.It remains at higher levels in teenagers later in the morning.They said this shows that teenagers have difficulty learning early in the morning.Yet most school systems in the United States begin high school classes at about seven o'clock.
[4]A few school districts have made some changes.In 1996,school officials in Edina,Minnesota,changed the start of classes from seven thirty to eight thirty.Two years later,the nearby city of Minneapolis did the same.Teachers there reported that students were no longer sleepy in class and were happier.Staying in school later in the day did not seem to be a problem for students who had jobs after school either.
[5]Health experts say that teenagers need between eight and nine hours of sleep a night.Students      are likely to be late for school,fail to do their homework,fall asleep in class and have trouble taking part in class discussions.
[6]Some people,however,don't support a later start time because they say that it would limit the time for practicing sports after school.However,the Minnesota schools found that this did not hurt school sports competitions.
[7]More American school districts are discussing the possibility of changing high school start times.Researchers and teenagers say that they cannot make the change quickly enough.

76.What is the best title of the passage?(Please answer within 8words.)High school classes start later?/Change high school start time
77.Please fill in the blank in the fifth paragraph with proper words or phrases to complete the sentence.(Please answer within 8words.)not getting enough sleep
78.Complete the following statement with proper words.(Please answer within 5words)If they go to bed very late at night,teenagerswill have difficulty/problem(s)(in)learning early in the morning.
79.Do you think the change is necessary?Why?(Please answer within 15words.)It is necessary,because students can study full of energy in the whole morning.
80.What does the word"this"(line 3,paragraph 6)probably refer to?(no more than 4words)alaterstarttime.

分析 本文论述了在美国是不是有必要将学习上学的时间进行变化,不同人给出了不同意见和看法.

解答 76.High school classes start later?/Change high school start time 主旨概括题.在第一段Medical research is leading American education officials to consider having high school classes start later in the morning…可以看出主要讲美国学校要改变上学的时间.
77.not getting enough sleep 细节题.根据后句are likely to be late for school,fail to do their homework,fall asleep in class and have trouble taking part in class discussions.可以得到由于睡眠不足导致很多的问题.
78.will have difficulty/problem(s)(in) learning 根据第一段最后一句When staying up late at night,the teenagers have problems learning early in the morning.青少年如果晚上睡的晚,早上在学习时就有困难了.
79.It is necessary,because students can study full of energy in the whole morning.个人观点态度题.通过全文的介绍可以知道作者很支持学校对时间的改变,因为只有足够的睡眠才可以保障精力充沛学习.
80.a later start time 猜测词意题.根据前句don't support a later start 可知,this在这里指代将时间推后.

点评 考查学生的细节理解和推理判断能力.做细节理解题时一定要找到文章中的原句,和题干进行比较,再做出正确选择.在做推理判断题时不要以个人的主观想象代替文章的事实,要根据文章事实进行合乎逻辑的推理判断.

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