单选题:下列符合图4所示含义的是(  )。

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题目内容:
下列符合图4所示含义的是(  )。
A.随pH从5升高到7,酶的活性逐渐降低
B.随pH从5升高到7,酶的最适温度不变
C.温度从0~A变化过程中.酶的活性逐渐降低
D.该酶的最适pH为7

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