单项选择题

According to the passage, static electricity can be caused by ______.

A．washing machines
B．wearing clothes made of natural materials
C．walking on artificial floor coverings
D．listening to the tape recorder
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单项选择题
People should ______ when deciding wheher to have a negative rich environment.
A．note their own reactions
B．move to a healthier area
C．observe domestic animals
D．watch how wealthy people behave
单项选择题
What effect does excessive positive onisation 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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