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问题 选择题
-5-9等于（　　）
A．4B．-4C．14D．-14
答案

答案：D

填空题

求曲线y=x2在x=2处的切线方程______．
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选择题
It is a pity that none of the _____ stopped _____ the poor man lying there, begging.

A. passer-bys; to help
B. passers-by; helping
C. passer-bys; helping
D. passers-by; to help
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