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问题 单项选择题

我国从1992年开始先后引进了一百多架苏-27型战斗机。这些战斗机已成为中国空军的主力机种。1997年俄罗斯与中国签订协议，从而使中国可以生产苏-27型战斗机。我国自己生产的这种战斗机被命名为歼-（）。

A、8

B、10

C、11

D、22

答案

参考答案：C

选择题

With more forests being destroyed, huge quantities of good earth ________ each year.[ ]

A. is washing away  

B. is being washed away

C. are washing away 

D. are being washed away
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选择题

He was suddenly ______ with a strange illness when he was about to finish his work.

A．seized

B．caught

C．hit

D．controlled
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