题目

为探索某淀粉酶最适作用温度而设计实验，下列设计不合理的是(    ) A．设置预实验              B．底物和酶混合前分别使其达到预设温度 C．底物与酶量都是固定的    D．用菲林试剂测试产物量确定因变量 答案：DThere are many man-made wonders in the world. One of them Stonehenge.A. is B. areC. was D. were