单项选择题

He felt (shame) of being unable to answer the teacher’s question选择能代替括号里的选项()

A.nervous
B.ashamed
C.uncomfortable
D.silly

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单项选择题

Now able to pay his own____, he continued his schooling at the University of Zurich.

A.costs
B.payments
C.prices
D.expenses

【计算题】
求函数y=x³在x=0点的切线方程。

答案：

y’=3x²
y’（0）=0
所以，在x=0处的切线方程为y=0