单选题
Which of the following is TRUE?
A、
A teacher's voice must be nicer than an actor.
B、
A teacher cannot decide beforehand what exactly he is going to say in class.
C、
A teacher must have better memory than an actor.
D、
A teacher has to learn by heart what exactly ha is going to say in class.
【正确答案】
B
【答案解析】
推理题。文章第三段告诉我们教师要根据学生反馈来讲解，学生会问什么问题有时候是预想不到的，所以选择B答案。
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