【解析】细节理解题。根据文章最后一段第一句可找到答案。

　　.短文改错

　　(2016长春外国语学校高三一质检)

　　A survey basing on 1,000 students found that 80% of senior students sleep less than nine hours every night.One main reason lies at students' bad habits.Too much homework is given by school teachers is another main cause.Some students are absent­minded while doing their homework, and some wasting their after­class time.The third cause was that some students have to get up earlier on weekday to get to school that far away from home.Experts think an amount of homework for the students should be cut down.Beside, teachers should encourage their students make good use of their spare time.Only in this way can the students improve our study efficiency.

　　【答案】

　　A survey

　　on 1,000 students found that 80% of senior students sleep less than nine hours every night.One main reason lies

　　students' bad habits.Too much homework is given by school teachers is another main cause.Some students are absent­minded while doing their homework, and some

　　their after­class time.The third cause

　　that some students have to get up earlier on to get to school that far away from home.Experts think

　　amount of homework for the students should be cut down.， teachers should encourage their students make good use of their spare time.Only in this way can the students improve

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