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

A．asking

B．asked

C．being asked

D．ask

对于非电离辐射的控制与防护说法正确的是( )。

A．对红外线辐射的防护，重点是对皮肤的保护
B．对微波辐射的防护，是场源屏蔽、距离防护和合理布局
C．对紫外线辐射的防护是屏蔽和增大与辐射源的距离，佩戴专用的防护用品
D．激光器工作室围护结构应使用反光材料，色调要明亮