单项选择题

What effect does excessive positive onisation 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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单项选择题
By observing the behavior of animals, scientists may be able to ______.
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单项选择题
People should ______ when deciding wheher to have a negative rich environment.
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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