A. Rivers may be a source of the greenhouse gas nitrous oxide.

　　B. It’s human activities that release nitrogen into the environment.

　　C. How to reduce nitrous oxide emissions from river networks

　　D What to do with the climate change caused by nitrous oxide.

　　【参考答案】1—4、ADDA

　　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。

　　The Maldives faces the threat of extinction from rising sea levels, but the government said on Thursday it was looking to the future with plans to build homes and a golf course that float.

　　An increase in sea levels of just 18 to 59 centimeters would make the Maldives—a nation of tiny coral islands in the Indian Ocean—virtually uninhabitable by 2100, the UN’s climate change panel has warned.

　　President Mohamed Nasheed has vowed a fight for survival, and last month he signed a deal with a Dutch company to study proposals for a floating structure that could support a conference centre, homes and an 18-hole golf course.

　　“It is still early stages and we are awaiting a report on the practicality,” a government official who declined to be named said.

　　The company, Dutch Docklands, is currently building floating developments in the Netherlands and Dubai. There was no immediate comment from the firm but its website said it undertook projects that make “land from water by providing large-scale floating constructions to create similar conditions as on land”.

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