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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.  
【C15】
选项 A、discouraging
B、disclosing
C、discovering
D、disregarding
答案A
解析 括号内的信息是对上文观点(encouraging countries to plant trees)的另一种阐释，两者是同义表达。logging“伐术”与plant trees具有相反语义。因此，此处人们对待此种行为的态度也应与encourage相对，故选A项discouraging“阻止”。B项disclosing“公开”砍伐行为只是人们阻止伐木的一种方式，在与上文encourage对应时不如discourage贴切。“发现”(C项discovering)和“忽视”(D项disregarding)问题的存在均不能解决问题，与下文的“是目前减少温室气体排放最……的方法”不符。
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