单项选择题

What effect does excessive positive ionization have on some people

A．They think they are insane.
B．They feel rather bad-tempered.
C．They become violently sick.
D．They are too tired to do anything.
<上一题 目录 下一题>
热门 试题

单项选择题
According to the passage, static electricity can be caused by_________.
A．using home-made electrical goods
B．wearing clothes made of natural materials
C．walking on artificial floor coverings
D．copying TV programs on a computer
相关试题