单项选择题

How were the Negroes treated in the history books

A．They were ignored.
B．They were condemned.
C．They were belittled.
D．They were praise
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单项选择题
We can infer from the first two paragraphs that the industrialists disregard environmental protection chiefly because _______.
A．they are unaware of the consequences of what they are doing
B．they are reluctant to sacrifice their own economic interests
C．time has not yet come for them to put due emphasis on it
D．it is difficult for them to take effective measures
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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