单项选择题

"Defied" in the 5th paragraph probably means "______"

A．supported
B．gave proof to
C．challenged
D．agreed to
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单项选择题
Which of the following is closest in meaning to the sentence Man, ...is part of nature. (Line 3-4, Para. 1)
A．Man appears indifferent to what happens in nature.
B．Man acts as if he does not belong to nature.
C．Man can avoid the effects of environmental pollution.
D．Man can escape his responsibilities for environmental protection.
单项选择题
What is the author's attitude towards the environmental effects of pesticides
A．Pessimistic.
B．Indifferent.
C．Defensive.
D．Concerned.
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