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【单选题】
已知函数y=f（x）的图象与函数y=x 2 （x≥0）的图象关于直线y=x对称，那么下列情形不可能出现的是（ ）A.
函数y=f（x）有最小值
B.
函数y=f（x）过点（4，2）
C.
函数y=f（x）是偶函数
D.
函数y=f（x）在其定义域上是增函数
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A.
It's growing slack.
B.
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A.
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A.
Nothing new. How about you?
B.
The usual.
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D.
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