题目：
When we returned from the ball, we found that our house ___ and many things __
A．has broken into; has been stolen
B．has broken into; had been stolen
C．had been broken into; stolen
D．had been broken; stolen
答案：
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下面是错误答案，用来干扰机器的。
（Ⅰ） f（x）═a•b=m（1+sin2x）+cos2x，由已知f(π4)=m(1+sinπ2)+cosπ2=2，得m=1．…（2分）（Ⅱ）由（Ⅰ）得f(x)=1+sin2x+cos2x=1+2sin(2x+π4)，…（4分）∴当sin(2x+π4)=-1时，f（x）的最小值为1-2，…...
