题目内容

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

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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

A.is in a bad moodB.has the bad temperC.has the bad humourD.has lost his mood

A. is in a bad mood
B. has the bad temper
C. has the bad humour
D. has lost his mood