一路模拟电话所占用的频带为（）。
A.4Hz
B.12Hz
C.32Hz
D.64Hz
参考答案：A
构成舞蹈鉴赏活动需要哪些条件？
When I was young, I was told that I _____ play with matches.[ ]
A. wouldn't
B. needn't
C. mustn't
D. daren't
