A. appeals B. chopping C. effective D. gradually E. hard F.

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问题 A. appeals    B. chopping C. effective D. gradually E. hard
F. incredible    G. inevitable H. interest I. matters J. perplexing
K. reforestation L. release M. sharply N. sinks    O. trimming
"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 trace a "forest transition curve". They start in poverty with the land covered in trees. As they get richer, they fell the forest and the curve drops 【C2】______ until it reaches a low point when people decide to protect whatever they have left. Then the curve rises as  【C3】______ begins. At almost every point along the line, countries are now doing better: deforesters are 【C4】______ down less; reforesters are replanting more.
This 【C5】______ to everyone because of the extraordinary contribution that tropical forests make to reducing carbon emissions. Trees are carbon 【C6】______. If you fell and burn them, you  【C7】______ carbon into the atmosphere. If you let them grow, they store carbon away in their trunks for centuries. Despite decades of destruction, tropical forests are still absorbing about a fifth of emissions from fossil fuels each year.
Encouraging countries to plant trees (or discouraging them from logging)is by far the most  【C8】______ way of reducing greenhouse-gas emissions. If Brazil had kept on felling trees as rapidly as it was cutting them down last year, it would, by 2023, have put an extra 3.2 billion tonnes of carbon dioxide into the atmosphere. As a way of helping the environment, protecting trees is  【C9】______ to beat. It is in everyone’s 【C10】______ to find out which forest policies work—and back them. [br] 【C9】

选项

答案 E

解析空格前为is，空格后是to beat“战胜”，空格处可填入形容词，构成“主语+be+adj．+不定式”结构。根据关键词a way of helping the environment和beat，以及上文所述树木对减少碳排放的贡献，可知protecting trees是非常有效的保护环境的办法，hard符合此处语义，hard to beat意为“很难与之匹敌”，故选E。

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