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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 reaches 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 defor-esters 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 carbon 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“伐木”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”。
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