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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.  
【C6】
选项 A、table
B、line
C、telegram
D、route
答案B
解析 本部分对forest，transition curve“森林过渡曲线”进行了详细解释。其中提及不同时期森林覆盖率的变化(drops，a low point，rises)，这些点是在森林过渡曲线上，故选B项line“线”，为上文curve的同义表达。A项table“表格”、C项telegram“电报”和D项route“路线”均不能与curve呼应。
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