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问题 选择题

— What do you think of the rules? 

— I think sixteen-year-olds should be allowed            sports after school. [ ]

A. to play

B. playing

C. played

D. to playing

答案

答案：A

单项选择题

Last year, an appliance store sold an average (arithmetic mean) of 42 microwave ovens per month. In the first 10 months of this year, the store has sold an average (arithmetic mean) of only 20 microwaves per month. What was the average number of microwaves sold per month during the entire 22-month period ？（）

A.21

B.30

C.31

D.32

E.44
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选择题

小明在实验室整理仪器时不小心将酒精灯碰倒，酒精撒到实验台上，但没有发生燃烧，其原因是（　　）

A．没有达到着火点

B．酒精是液体的

C．没有与氧气接触

D．酒精易挥发
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