-Must I clean the floor now?

-_____. It is too dirty.[ ]

A. Yes, you needn't

B. No, you needn't

C. No, you mustn't

D. Yes, you must

容易产生心理共鸣歌曲的（），符合情感波动的动态。

A、身体波动

B、表情波动

C、节奏波动

D、旋律波动