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问题 选择题

Please stop           and listen to the teacher carefully.[ ]

A. talk            

B. talking

C. to talk          

D. talked

答案

答案：B

单项选择题

On hearing of the case some time later, Conan Doyle was convinced that the man was not guilty, and immediately went to work to ascertain the truth.

A. explore
B. obtain

C. verify

D. search
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选择题
要使分式
x-2
2x-3
的值为零，则x的值为（　　）
A．-2B．2C．-
3
2
D．
3
2
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