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问题 选择题

函数y=sin（2x2+x）导数是 [ ]

A．cos（2x2+x）

B．2xsin（2x2+x）

C．（4x+1）cos（2x2+x）

D．4cos（2x2+x）

答案

答案：C

选择题

— What happened?  

— Danny _____ his tail.  [ ]

A. break    

B. breaks   

C. broke    

D. breaking
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选择题

Poor Tim! He had his pocket ________on his way to the theatre. So he had to give up his favourite play.

A．robbed

B．cheated

C．picked

D．stolen
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