单项选择题

A．To be a mathematician.
B．To write his own books.
C．To teach in high school.
D．To be a medical doctor.
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单项选择题
A．When the ecological balance of the river is lost.B．When people consume more fish than they used to.C．When large numbers of algae, fish and birds are killed.D．When the production of marine petroleum is increased.
A．When the ecological balance of the river is lost.
B．When people consume more fish than they used to.
C．When large numbers of algae, fish and birds are killed.
D．When the production of marine petroleum is increased.
单项选择题
A．When they’re unable to control the person’s behavior.B．When the causes of the behavior are obvious.C．When the consequences of the behavior are unpleasant.D．When the behavior is expected.
A．When they’re unable to control the person’s behavior.
B．When the causes of the behavior are obvious.
C．When the consequences of the behavior are unpleasant.
D．When the behavior is expected.
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