单项选择题

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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单项选择题
The writer's general attitude towards the world leaders meeting at the UN is
A．supportive.
B．impartial.
C．critical.
D．comedic.
单项选择题
Which of the following best summarizes the text
A．As the UN hesitates, the poor take action.
B．Progress in environmental protection has been made since the Rio Summit.
C．Climate changes can no longer be neglected.
D．The decline of earth's life-support systems has been halted.
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