穿透效应使得屏蔽效应（）。
A.减弱
B.增强
C.增强了外层电子的屏蔽作用
D.无影响
参考答案：A
Look at . [ ]
A. my
B. I
C. me
D. our
Could you show us a digital camera?[ ]
A. how to use
B. what to buy
C. where to go
D. how can I use
