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
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.
单项选择题
According to the passage, the risk of prostate cancer would be lowered by ______ among those who consumed raw tomatoes more than once a day.
A．21 to 34 percent
B．30 to 60 percent
C．21 to 30 percent
D．34 to 60 percent
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