单项选择题

According to the text, why destruction of our natural resources and contamination of our food supply continue to occur

A．Inevitable phenomenon of social developing.
B．Few people are aware of it.
C．The tax exerted on manufacturer is too heavy.
D．Difficulty in affixing legal responsibility on the people who caused the problem.
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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 control environmental pollution
D．to improve the quality of life by enforcing environmental standards
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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