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All over the world, forests are safeguarding the health of the planet itself. They do this【C1】______protecting the soil, providi
All over the world, forests are safeguarding the health of the planet itself. They do this【C1】______protecting the soil, providi
admin
2011-03-01
37
问题
All over the world, forests are safeguarding the health of the planet itself. They do this【C1】______protecting the soil, providing water and【C2】______the climate. Trees【C3】______soil to mountainsides. Hills【C4】______the trees have been felled lose 500 times as【C5】______soil a year as those with trees.
Trees catch and【C6】______rainwater. Their leaves break the impact【C7】______the rains, robbing them of【C8】______destructive power. The roots of trees allow the water to go into the soil,【C9】______gradually releases it to flow down rivers and refill ground-water reserves. Where there are no【C10】______, the rains run in sheets of water off the land,【C11】______the soil with there Land【C12】______with trees and other plants【C13】______20 times more rainwater than【C14】______earth. As they grow, trees absorb carbon dioxide, the main【C15】______of the "greenhouse effect", which【C16】______irreversibly to change the world’s climate. Together, the world’s trees, plants and soils contain three times as much carbon as【C17】______is in the atmosphere.
The world’s forests【C18】______the vast majority of its animal and plant species. The tropical rainforests【C19】______have well over half of them,【C20】______they cover only about 6% of the Earth’s land surface.
【C16】
选项
A、warns
B、attempts
C、threatens
D、approaches
答案
C
解析
考查动词辨义与用法。warn警告,警示(它多作及物动词,作不及物动词时后面跟不定式的否定式,不跟肯定式)attempt试图,企图;threaten(不好的事)将要发生,逼近;approach靠近,接近(它作动词时不跟不定式)。由于这里指的是温室效应会使世界气候变化这一不好的事,所以[C] ,是正确答案。
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