The rainforest of the Amazon River basin provides a valuable resource to the entire planet，but it is being destroyed．People are moving into the Amazon basin and clearing the rainforest to build cities．The rainforest is often cleared to create land for feeding cattle．Finally，miners clear the land in order to get its minerals．

　　The deforestation (砍伐森林) of the Amazon basin may have long reaching effects．When the trees are removed，we reduce the amount of CO2 taken from the air．Some scientists predict that the build-up of CO2 will cause global warming．If the temperature of the earth rises，polar ice will melt，which will raise the level of the ocean and possibly， flood south Florida．

　　1．According to the text，the Amazon River ________．

　　A．has changed the environment on the Andes Mountains

　　B．is becoming more and more fragile due to droughts and floods

　　C．is the source of a fifth of the total amount of freshwater in the world

　　D．dilutes the salt water of the Pacific Ocean

　　2．The underlined word “harnessed” in Paragraph 2 can be replaced by “________”．

　　A．moved

　　B．divided

　　C．controlled

　　D．used

　　3．Paragraph 2 mainly explains ________．

　　A．why the Amazon River basin is a fragile ecosystem

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