单选题：What did the UN call on nations to do about CO2 and other gr

题目内容：
What did the UN call on nations to do about CO2 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 CO2 and other gases.

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分类：公共英语五级  题型：单选题
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