单项选择题

The main task now facing ecologists, environmental activists and conservationists is______.

A．to prevent pollution by legislation, economic incentives and persuasion
B．to arouse public awareness of the importance of environmental protection
C．to take radical measures to consol environmental pollution
D．to improve the quality of life by enforcing environmental standards
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单项选择题
According to the passage what is unknown to many people is that______
A．the drip cup benefited light industry.
B．the truth about carver was twisted or concealed.
C．sugar-refining owes a lot to a Negro.
D．a Negro invented the frying pan.
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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