In an effort to reduce the number of fires started by cigarettes, a major tobacco company is test-marketing a cigarette in which thin layers of extra paper are used to decrease the amount of oxygen entering the cigarette, thereby slowing the rate at which it burns and lowering the heat it generates.


in which thin layers of extra paper are used to decrease the amount of oxygen entering the cigarette, thereby slowing

in which they use thin layers of extra paper in decreasing the amount of oxygen entering the cigarette, which slows

that uses thin layers of extra paper to decrease the amount of oxygen when it enters the cigarette, thereby slowing

for which thin layers of extra paper are used to decrease the amount of oxygen that enters the cigarette, and thereby slowing

using thin layers of extra paper in decreasing the amount of oxygen entering the cigarette, which slows

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考题讲解

题目分析：
本题可以判断的考点很多。实际上，这种文字内容和选项均比较长的考题反而相对比较容易。

选项分析：

A选项：Correct. 本选项在语法和逻辑上均是正确的。

B选项：本选项有三处错误。第一，在选项的开端出现了代词they，其指代对象必须是语境中出现过的且逻辑上合理的复数名词。但是，本题中并没有这个名词。第二，需将介词短语in decreasing改为不定式短语to decrease。这点考查了不定式和ing的区别。用之于本题，选项的意思是“更细小的特殊的纸和额外的纸被用来减少进氧量”，因此，谓语动词use的约束力较强，需要用不定式短语。第三，which slows应该改为现在分词slowing。which slows是一个非限定性定语从句，其应该就近修饰名词the cigarette；相反地，thereby slowing可以做其主句thin layers of extra paper are used to decrease the amount of oxygen entering the cigarette的伴随状语，其主语可以是thin layers of extra paper。在逻辑上，降低燃烧率的只能是特殊的“纸”，而不能是香烟（香烟本身并不能降低燃烧率，而是香烟中的纸降低燃烧率）。

C选项：我们不能用that uses thin layers而必须用in which thin layers。这是因为，香烟不能主动的用纸（即，香烟不能主动的发出use这个动作），而应该是某些专家或者研究者“在香烟中”加纸。

D选项：最后and身后是现在分词短语slowing，在其身前没有平行的对象。

E选项：using thin layers是现在分词短语，其作定语修饰名词the cigarette。香烟不能发出use这个动作，错误同选项(C)。第二，in decreasing应该改成不定式短语to decrease，该错误同选项(B)。第三，which slows最后应该改成现在分词短语slowing，该错误同选项(B)。

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