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
People should be able to come to a decision about ions in the air if they ______.
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 ions 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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