1. The writer’s general attitude towards the world leaders meeting at the UN is _______。
　　[ A ] supportive
　　[ B ] impartial
　　[ C ] critical
　　[ D ] comedic
　　2. What does the author say about the ordinary people in the Third World .countries?
　　[ A ] They are beginning to realize the importance of environmental protection.
　　[ B ] They believe that many children are necessary for prosperity.
　　[ C ] They are reluctant to accept advice from the government.
　　[ D ] They think that earning a living is more important than nature conservation.
　　3. 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.
　　4. The word “deforestation” in Paragraph 3 means _______。
　　[ A ] forest damage caused by pollution
　　[ B ] moving population from forest to cities
　　[ C ] the threat of climate change
　　[ D ] cutting large areas of trees
　　5. 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.