题目内容:
By“we don’t have 500 million years to wait”(Line 4,Para.6),the author suggests that_____.
A.we have no enough time to allow the earth to recover from damages B.we have no enough time to witness the evolution of a species
C.it’s urgent for humans to take steps to prevent global warming
D.it's necessary for humans to stop maltreatment of the planet
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答案解析: