42 .

　　One of the major problems is the destruction (毁灭) of the rainforests in South America. They are 3.________ to half the world’s species and to millions of people. Moreover, the rainforests 44.________ the air by taking in carbon dioxide and giving out oxygen. The trees are being 45.________ for paper or to make room for cattle farms. So birds and animals 46.________ their homes and die. This destruction is also causing 47.________ in the climate, air pollution and flooding. If we 48.________ to burn and cut down the rainforests as we are doing now, the earth will 49.________ be the same.

　　Another big 50.________ is water pollution. Factories are 51.________ our rivers and lakes with dangerous chemicals. Tons and tons of waste are poured into our seas.

　　52 , sea life is in danger.

　　53.________ pollution is another important issue. The cars and factories in and around our cities are giving off 54.________ gases. In the past few years, more and more people than ever before have breathing problems. If we don’t do something now, our cities will become

　　55 to live in.

　　56 , it is not too late to solve these problems. We have the time, the money and even the technology to prepare the way for a better, cleaner and 57.________ future. We can plant trees and create parks for endangered species. We can put pressure(压力)

　　on those in power to

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