大学英语六级听力——012(Tropical forests in the world)
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The world's forests(森林) are disappearing.As much as one third of the total tree cover has been lost, since agriculture began some ten thousand years ago.The remaining forests are home to half of the world's species,thus becoming the chief resource(主要的资源) for their survival(幸存者).Tropical rain forests(热带雨林) once covered 12% of the land of the planet(行星),as well as supporting at least half of the world's species of plants and animals. These rainforests(热带雨林) are home to millions of people.
But there are other demands on them,as well.For example,much wood has been cut for timber(木材).An increasing amount of forest land has been used for industrial purposes or for agriculture development such as crop growing(农作物栽培).By the 1990s less than half of the earth's original rainforests remained(保留),and they continued to disappear at an alarming rate(以惊人的速度) every year.As a result,the world's forests are now facing gradual(逐渐的) extinction(消失).
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- 大学英语六级听力——012(Tropical forests in the world)
- 大学英语六级听力——009(The Sun)
- 大学英语六级听力——014(the important confidence)
- 大学英语六级听力短文——001(Education in China)
- 大学英语六级听力——003(Emotions)
- 大学英语六级听力——005(Describing people )
- 大学英语六级听力——006(Physical activity)
- 大学英语六级听力——007(An old man)
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