单项选择题

A．Husband and wife.
B．Teacher and student.
C．Policeman and driver.
D．Mother and son.
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单项选择题
The views of Ravitch and Emerson on schooling are______.
A．identical
B．similar
C．opposite
D．complementary
单项选择题
Which of the following, according to the author, should play the leading role in the solution of environmental problems
A．Legislation and government intervention.
B．The industry’’s understanding and support.
C．The efforts of environmental health professionals.
D．The cooperation of ecologists, environmental activists and conservationists.
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