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  3. "Forests are the lungs of our land," said Franklin Delano Roosevelt. Twenty years ago, the world’s lungs were diseased. Roughly

"Forests are the lungs of our land," said Franklin Delano Roosevelt. Twenty years ago, the world’s lungs were diseased. Roughly

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问题     "Forests are the lungs of our land," said Franklin Delano Roosevelt. Twenty years ago, the world’s lungs were diseased. Roughly half of all the planet’s once-luxuriant tropical forests had been felled and the further deterioration of the Earth’s green spaces seemed【C1】________.
    Over time countries【C2】________a "forest transition curve". They start in【C3】________with the land covered in trees. As they get richer, they fell the forest and the curve drops sharply until it reach-es a low point when people decide to【C4】________whatever they have left. Then the curve rises as reforestation【C5】________At almost every point along the【C6】________, countries are now doing better: deforested are【C7】________down less; reforesters are【C8】________more.
    This matters to everyone because of the extraordinary【C9】________that tropical forests make to reducing carbon emissions. Trees are carbon【C10】________. If you fell and burn them, you【C11】________carbon into the atmosphere. If you let them【C12】________they store carbon away in their trunks for centuries. Despite decades of【C13】________, tropical forests are still【C14】________about a fifth of emissions from fossil fuels each year.
    Encouraging countries to plant trees (or【C15】________them from logging) is by far the most【C16】________way of reducing greenhouse-gas emissions.【C17】________Brazil had kept on felling trees as rapidly as it was cutting them【C18】________in 2005, it would, by 2013, have put an extra 3.2 billion tonnes of car-bon dioxide into the atmosphere. As a way of【C19】________the environment, protecting trees is hard to beat. It is in everyone’s interest to find out which forest policies work—and【C20】________them.  
【C1】
选项 A、avoidable
B、vital
C、inevitable
D、perplexing
答案C
解析 空格所在句提及“地球上曾经茂密的热带雨林近一半被砍伐”，而植被遭破坏之后恢复的周期很长，一半的热带雨林被砍伐，说明情况很严重，据此推断地球绿地进一步退化是必然的事。故先C项inevitable“必然(发生)的，不可避免的”。A项avoidable“可避免的”与句中语义相反。B项vital和D项perplexing代入后表示“地球绿地进一步退化是至关重要的或令人费解的”，句意不通，故排除。
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