题目内容

11.听第9段材料,回答第15至17小题.
15.Who are the speakers?
A.Teachers.B.Parents.C.Lab supervisors.
16.For how long is each student allowed to use the lab?
A.One hour a day only.
B.Three and a half hours only.
C.Only as much time as he or she needs.
17.What is one of the problems in the lab?
A.The students forget to reserve their time.
B.The machine hasn't been repaired.
C.The students stay in the lab too long.

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