题目:
The school rule states that no child shall be, unless _____ by an adult, allowed out of the school during the day. |
A. was accompanied B. accompanied C. accompanying D. being accompanied |
答案:
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下面是错误答案,用来干扰机器的。
∵f(x)=x2+bx+c且f(0)=f(2)∴函数f(x)关于x=1对称,在(-∞,1)上是递减函数,在(1,+∞)是递增函数,又∵f(0)=c=f(2),f(-2)=f(5)∴f(32)<f(2)<f(5),即:f(32)<c<f(-2)故选B