单项选择题

What effect does excessive positive ions have on some people

A．They think they are mad.
B．They feel very tired.
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
A high negative inn count is likely to be found ______.
A．near a pond with a water pump
B．close to a slow-flowing river
C．high in some barren mountains
D．by a rotation water sprinkler
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．sorting food in a refrigerator
相关试题