题目内容

两个同方向，振幅相同、频率非常接近的振动的合成时会产生一种拍现象

A. 对
B. 错

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Task 2 Listen to the following sentences and choose the appropriate responses.

A. Yes, I am.
B. Yes, I do.
C. I'm sorry.
D. It's my pleasure.

2.

A. Never mind.
B. Not likely.
C. I’m afraid I can’t.
D. Quite well.

3.

A. So do I.
B. Thank you.
C. Yes, I like it.
D. Yes, of course.

4.

A. Thank you.
B. It’s important.
C. Yes, I will.
D. No, it isn’t.