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题型:语法填空-短文语填 难度:0.65 引用次数:201 题号:18805047
阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。

Despite occupying a relatively small area, rainforests have an important role to play in maintaining the world and they are home to a rich     1     (various) of medicinal plants, birds and animals.

As the lungs of the planet, rainforests have their own perfect system,     2     ensures their own survival. The tall trees make a canopy (顶篷) of branches and leaves that protect themselves, smaller plants and the forest animals from heavy rain, intense dry heat     3     (release) from the sun and strong winds.     4     (amazing), the trees grow in such a way that their leaves and branches, although close together, never actually touch     5     of another tree. Scientists think this is a deliberate way     6    (prevent) the spread of any tree discases. The ground floor of the forest is not all twisted leaves and bushes,     7     a fairly clear land. It is where leaves transform     8     food for the trees and other forest life.

Worryingly, rainforests around the world are disappearing at     9     alarming rate. A few thousand years ago, rainforests     10     (cover) as much as 12 per cent of the land surface on Earth, but today this has fallen to less than 7 per cent.

【知识点】 科普知识 环境保护

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