Question

4．听下面一段材料，回答第17至20四个小题．
17．What is the purpose of having high school classes start later in the morning？
  A．To let teenagers stay up late at night．
  B．To let teenagers get enough sleep．
  C．To make teenagers happy．
18．What time have the high schools in Edina，Minnesota start classes since 1996？
  A.9：30．        B.7：30        C.8：30
19．What do we learn form the text？
  A．Teenagers need more than nine hours'sleep a night．
  B．Not all adults support changing the times that school starts．
  C．Young children are more likely to be late for school．
20．Who are against changing school start times？
  A．Usually parents．
  B．Usually school officials．
  C．Some parents and school officials．

Answer 1

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