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 seaiment(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．

　　．We can infer from the text that _____.

　　A．higher temperatures couldn’t affect fishery productivity

　　B．rivers’dying out could affect food security

　　C．there are four Asian rivers mentioned in the passage

　　D．the Yangtze is polluted thanks to the lack of enough tributaries

　　2．The top 10 rivers are fast dying as a result of the following EXCEPT _____.

　　A. climate change

　　B．pollution

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