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根据短文内容判断正误。

    Mr. Brown is from England. He and his wife（妻子） are teachers . They teach English in Shanghai. They have a son and a daughter. They are John and Lucy. John is a middle school student, but Lucy is not. She is only six.

    They have two bikes. One is big, and the other is small. The big bike is for John. The small one is for Lucy.     On Sundays, sometimes they are at home, sometimes they go to the parks. They like China. They have a lot of Chinese friends.

设函数f(x)=x(ax²+bx+c)（$a\ne 0$）在x=1和x=-1处均有极值，则下列点中一定在x轴上的是（    ）