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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.
A．To be a mathematician.
B．To write his own books.
C．To teach in high school.
D．To be a medical doctor.
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.
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