Climate change，pollution，overuse of water and development are killing some of the world’s most famous rivers including China’s Yangtze．India’s Ganges and Africa’s Nile．WWF said on Tuesday．At the global launch of its report “World’s Top 10 Rivers at Risk”，the group said many rivers could dry out, affecting hundreds of millions of people and killing unique aquatic（水生的）life．
“If these rivers die，millions will lose their livelihoods，biodiversity（生物多样性）will be destroyed on a massive scale，there will be less fresh water and agriculture，resulting in less food security，”said．Rayi Singh，secretary—general of WWF—India．The report launched ahead of “World Water Day” today，also cited the Rio Grande in the United States，the Mekong and Indus in Asia，Europe’s Danube, La Plata in South America and Australia’s Murray—Darling as in need of greater protection．
Rivers are the world’s main source of fresh water and WWF says about half of the available supply is already being used up．Dams have destroyed habitats and cut rivers off from their flood plains．while climate change could affect the seasonal water flows that feed them，the report said．Fish populations，the top source of protein and overall life support for hundreds of thousands of communities worldwide，are also being threatened, it found．．The Yangtze basin is one of the most polluted rivers in the world because of decades of heavy industrialization，damming and huge influxes（流入）of sediment（积淀）from land conversion．
Climate change，including higher temperatures，also means serious consequences for fishery productivity，water supply and political security in Africa’s arid Nile basin．Tributaries（支流）flowing into the Ganges are drying up because of irrigation，WWF said．
小题1:hat is the text mainly about?
A．Saving fresh water in our life．
B．How to protect our rivers．
C．An important discovery．
D．World’s top 10 rivers are at risk．小题2:We can infer from the text that _____．
A．rivers’ dying out could affect food security
B．there are four Asian rivers mentioned in the passage
C．the Yangtze is polluted thanks to the lack of enough tributaries
D．higher temperatures couldn’t affect fishery productivity小题3:The top 10 rivers are fast dying as a result of the following EXCEPT _____．
A．climate change
B．wasting water
C．pollution
D．dams小题4:WWF is probably a name of _____．
A．an organization
B．a newspaper
C．a magazine
D．a report
小题1:D
小题2:A
小题3:B
小题4:A
题目分析：文章大意：你知道吗，WWF组织列出了世界十大濒临危险的河流。是什么原因造成的呢？
小题1:D主旨大意题。根据第一段并浏览全文不难看出本文的中心就是在说这十大濒临危险的河流。所以选择D。
小题2:A 推断题。 根据文章第二段there will be less fresh water and agriculture，resulting in less food security，可以确定答案用A。
小题3:B 细节题。文章开始就提到Climate change，pollution。后文第三段又提到Dams have destroyed habitats and cut rivers off from their flood plains．因此没提到的原因B。
小题4:A 推断题。根据文章第一段WWF said on Tuesday．At the global launch of its report “World’s Top 10 Rivers at Risk”，the group said many rivers could dry out, ……可推断出WWF是个group，即一个组织，所以选择A。