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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