单选题
What did the UN call on nations to do about CO
2
and other greenhouse gases in 1992?
A、
To sign a new climate treaty at Rio.
B、
To draft an agreement among UN nations.
C、
To force the United Sates to reduce its emissions.
D、
To limit the release of CO
2
and other gases.
【正确答案】
D
【答案解析】
[解析]由文章第四段可知本题答案为D。故应选D。
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