单项选择题

People should be able to come to a decision about ions in the air if they ______.

A．note their own reactions
B．move to a healthier area
C．observe domestic animals
D．watch how wealthy people behave
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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
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.
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