单项选择题

A high negative ion count is likely to be found ______.

A．near a pond with a water pump
B．close to a slowly flowing river
C．high on some barren mountains
D．near a fountain
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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
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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