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
By observing the behavior of animals, scientists may be able to ______.
A．prevent disasters
B．organize groups of people
C．predict earthquakes
D．control areas of California
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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