问题
选择题
—Could you tell me ?
—I’m confident and creative.[ ]
A. how are you
B. what you are like
C. what are you like
D. how you are
答案
答案：B
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—Could you tell me ?
—I’m confident and creative.[ ]
A. how are you
B. what you are like
C. what are you like
D. how you are
答案：B
，又f(x)在x=0处可导，则