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问题 选择题
函数f（x）=sin2x-cos2x的最小正周期是（　　）
A．
π
2
B．πC．2πD．4π
答案

函数f（x）=sin2x-cos2x=

2
cos（2x+
π
4
）

所以函数f（x）=sin2x-cos2x的最小正周期是：T=

2π
2
=π

故选B．

单项选择题

You are the project manager of a project which would do oil-exploration in the ocean．Since you cannot plan for all eventualities，you establish a contingency reserve，including amounts of time，money or resources to handle known or unknown risks．This is an example of______．

A．risk avoidance

B．risk transfer

C．active risk acceptance

D．improper risk planning since all risks should be identified and accounted for
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选择题

设p=0.95.1，m=5.10.9，n=log0.95.1，则p，m，n的大小关系是（　　）

A．p＜n＜m

B．n＜p＜m

C．n＜m＜p

D．p＜m＜n
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