单项选择题

Which of the following statements is true

A．That Negroes were docile was denied by the slaveholders.
B．That Negroes were docile was not quite tree.
C．That Negroes were docile was a lie fostered by their masters.
D．That Negroes were docile was sheer nonsens

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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.

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.