立案审批时限（）。
A.不得超过一个月
B.不得超过两个月
C.不得超过三个月
D.没有具体规定
参考答案：A
The magician picked several persons ________from the audience and asked them to help him with the performance.
A．by accident
B．at random
C．on occasion
D．on average
臭粉在空气中易风化。
