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
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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 Dr. Coles, ______.
A．there are as many advantages to being poor as there are to being rich
B．being rich can bring more problems than being poor
C．rich children can be deprived of the thing they are most in need of
D．wealth brings more disadvantages than advantages to rich children
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