单选题：图1是酶促反应示意图，甲、乙、丙、丁四种物质属于酶的是（　　）。

题目内容：

图1是酶促反应示意图，甲、乙、丙、丁四种物质属于酶的是（　　）。

A．甲
B．乙
C．丙
D．丁

参考答案：

答案解析：

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