When ________ what made him a popular person, he said it was his personality.

A．asking

B．asked

C．being asked

D．ask

如图所示，在地面上有一单摆，做左右小角度摆动，其周期T=             （图中所标出的字母均为已知量，当地的重力加速度为g）；若考虑到单摆摆动时空气浮力的影响，则周期将         。（填“变大”、“不变”、“变小”）