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
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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 slow-flowing river
C．high in some barren mountains
D．by a rotation water sprinkler
单项选择题
What effect does excessive positive ionization 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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