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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.  
【C10】
选项 A、detectors
B、sinks
C、generators
D、producers
答案B
解析 上文提及热带雨林能减少(reduce)碳排放，因此应选与reduce呼应的B项sinks“吸收池”。A项detectors“探测器”不能减少碳排放。C项generators“产生者”和D项producers“生产者”则会增加碳排放。
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