Since then the number of people who were

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问题选择题

Since then the number of people who were addicted to smoking ________ 20%. [ ]

A. has reduced to

B. reduces by

C. has reduced by

D. have reduced by

答案

答案：C

写句子

　　经过三年的艰苦奋战，即将到了生命的中转站——中考，请发一个短信给你的同桌，勉励他考出佳绩，达成愿望。（要运用一种修辞方法，不超过20字）

短信内容：。

所用方法：。

判断题

摇摆式单向阀阻力小，阀阻漏性能差，只能装在水平管道上。