题目内容

过曲线y=2x2-1上一点P(1，1)处的切线的斜率是（） (A)4 (B)3 (C)1 (D)-4

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函数Y=2x3-6x2+7的单调减区间是（） (A)(-∞，0) (B)(0，2) (C)(2，+∞) (D)(-2，4)

答案为：

A. satisfy its need
B. have its use
C. fit its purpose
D. adapt to request

He had gone away on business and would notreturn to the hotel until the next day—should have to wait till_________I couldthank him for the present．

A. afterwards
B. then before
C. then
D. then therefore

下列函数中，函数值恒大于零的是（） (A)y=x2 (B)y=2x (C)y=㏒2x (D)y=cosx