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2022年英语专四听力dictation备考训练（92）

2021-11-23 17:38:00来源：网络

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　　Tropical Forests in the World

　　The world's forests are disappearing. As much as 1/3 of the total tree

　　cover has been lost since agriculture began some 10,000 years ago. The

　　remaining. forests are home to half of the world's species, thus becoming the

　　chief resource for their survival. Tropical rain forests once covered 12% of the

　　land of the planet, as well as supporting at least half of the world's species

　　of plants and animals. These rain forests are home to millions of people. But

　　there are other demands on them as well. For example, much wood has been cut for

　　timber. An increasing amount of forest land has been used for industrial

　　purposes or for agricultural development such as crop-growing. By the 1990's,

　　less than half of the earth's original rain forests remained, and they continue

　　to disappear at an alarming rate every year. As a result, the world's forests

　　are now facing gradual extinction.

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