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问题 单项选择题

连续监测法测酶活性浓度的常数K值，改变其大小最方便的途径为（）

A.改变标本稀释度

B.改变监测时间长短

C.改变底物浓度

D.改变酶反应温度

E.改变酶反应的pH值

答案

参考答案：A

问答题 简答题

简述教学过程的本质。
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句型转换

把下列直接引语改为间接引语。

1. Mary said, "My sister doesn't want to go there."

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2. John said to me, "I'm doing my homework now."

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3. He said to me, "I can sing in English."

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4. He aksed, "Why are you late for school, Jimmy?"

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5. Lucy said, "I'm going to the beach tomorrow."

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