题目内容:
The main idea of the passage is that________________
A.the possible exit of the United States could mark the end of the Kyoto Protocol B.the terms of the Kyoto Protocol are overly ambitious, and thus inapplicable in reality
C.in order for the Kyoto Protocol to-succeed, it must be reviewed and possibly modified
D.in light of its unequal treatment of under-developed nations, the Kyoto Protocol is doomed to failure
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