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One of the reasons tropical forests are being cut down so rapidly is demand for the hardwoods that grow there. Hardwoods, as the
One of the reasons tropical forests are being cut down so rapidly is demand for the hardwoods that grow there. Hardwoods, as the
admin
2013-07-11
51
问题
One of the reasons tropical forests are being cut down so rapidly is demand for the hardwoods that grow there. Hardwoods, as their【C1】______suggests, tend to be denser and more durable than softwoods. But their unsustainable logging【C2】______not only forests but also【C3】______creatures and the future prospects of the people who lived there.
It would be better to【C4】______softwood, which grows in cooler regions in【C5】______managed forests. Softwoods are fast-growing species that【C6】______80% of the world’s timber. But the stuff is not durable enough to be used outdoors【C7】______being treated with poisonous chemicals to protect it【C8】______insect pests. These chemicals eventually【C9】______out into streams and rivers, and the wood must be retreated. 【C10】______, at the end of its life, wood that has been treated with such kind of chemicals in this way needs to be disposed of【C11】______.
One way out of this problem would be an environmentally【C12】______way of making softwood harder and more durable—something that a Norwegian company called Kebony has now【C13】______.
Kebony stops wood from rotting【C14】______placing in a large container containing a 【C15】______called furfuryl alcohol(糖醇), which is【C16】______from the waste left over when sugarcane(甘蔗)is processed. The container is then pressurised, 【C17】______the liquid into the wood. Next the wood is dried and heated to 110℃, which makes the cell walls of the wood thicker and【C18】______.
Of course, treating wood makes it more【C19】______. But because it does not need to receive【C20】______treatments, it should prove economical over its lifetime.
【C17】
选项
A、pulling
B、letting
C、forcing
D、keeping
答案
C
解析
考查动词辨析。空前的pressurised一词表示“加压”,四个选项中只有forcing跟“加压”有语义关联,代入表示“强使糖醇这种液体渗入木材之中”,符合语义逻辑,故选forcing。
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0
大学英语四级
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