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(荷爾蒙) 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 本文論述了在美國是不是有必要將學習上學的時間進行變化,不同人給出了不同意見和看法.

解答 76.High school classes start later?/Change high school start time 主旨概括題.在第一段Medical research is leading American education officials to consider having high school classes start later in the morning…可以看出主要講美國學校要改變上學的時間.
77.not getting enough sleep 細節(jié)題.根據(jù)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導(dǎo)致很多的問題.
78.will have difficulty/problem(s)(in) learning 根據(jù)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,早上在學習時就有困難了.
79.It is necessary,because students can study full of energy in the whole morning.個人觀點態(tài)度題.通過全文的介紹可以知道作者很支持學校對時間的改變,因為只有足夠的睡眠才可以保障精力充沛學習.
80.a(chǎn) later start time 猜測詞意題.根據(jù)前句don't support a later start 可知,this在這里指代將時間推后.

點評 考查學生的細節(jié)理解和推理判斷能力.做細節(jié)理解題時一定要找到文章中的原句,和題干進行比較,再做出正確選擇.在做推理判斷題時不要以個人的主觀想象代替文章的事實,要根據(jù)文章事實進行合乎邏輯的推理判斷.

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