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专四听写训练59:rainforest

所属:专四专八 阅读:3507 次 评论:0 条 [我要评论]  [+我要收藏]

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Rainforests are the lungs of the planet – storing large quantities of carbon dioxide and producing a significant amount of the world’s oxygen. Rainforests have their own perfect system for guaranteeing their own survival. The tall trees make a cover of branches and leaves which protect themselves, smaller plants, and the forest animals from heavy rain, dry heat and strong winds.

Amazingly, the trees grow in such a way that their leaves and branches, although close together, never actually touch those of another tree. Scientists think this is a deliberate method to prevent the spread of any tree diseases and make life more difficult for leaf-eating insects.

They are not called rainforests for nothing! Rainforests can produce 75% of their own rain. At least 80 inches of rain a year is normal – and in some areas there may be as much as 430 inches of rain annually. This is real rain. In just two hours, streams can rise ten to twenty feet.

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2011-09-10 13:17 编辑:wjy2005tom
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