A. try to understandB. come up with

　　C. hide away

　　D. have a thorough discussion

　　4. Greenhouse gas emissions caused by forest destruction　.

　　A. are the same amount by transport on earth

　　B. take 20% of global greenhouse gas emissions

　　C. can be avoided by setting measures only

　　D. have nothing to do with climate change

　　5. From the text we can learn that healthy forest　.

　　A. can keep us healthy and happy

　　B. can increase the effect from global warming

　　C. can be helpful in adjusting the temperature

　　D. can give out large amounts of carbon

　　【参考答案】1—5、ABDBC

　　较难题目特训：节能环保类

　　阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。

　　Rivers may be a significant source of the greenhouse gas nitrous oxide (一氧化二氮), scientists now find.

　　Their calculation suggests that across the globe the waterways contribute three times the amount of nitrous oxide to the atmosphere as had been estimated by the International Panel on Climate Change (IPCC), the United Nations scientific body charged with reviewing climate change research. They found that the amount of nitrous oxide produced in streams is related to human activities that release nitrogen (氮) into the environment, such as fertilizer use and sewage discharges.

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