GMAT语法试题怎么做有效？本文以一道典型语法题为例，为大家做讲解。
Unlike the acid smoke of cigarettes, pipe tobacco, cured by age-old methods, yields an alkaline smoketoo irritating to be drawn into the lungs.
(A) Unlike the acid smoke of cigarettes, pipe tobacco, cured by age-old methods, yields an alkaline smoke
(B) Unlike the acid smoke of cigarettes, pipe tobacco is cured by age-old methods, yielding an alkaline smoke
(C)Unlike cigarette tobacco, which yields an acid smoke, pipe tobacco, cured by age-old methods, yields an alkaline smoke
(D) Differing from cigarettes’ acid smoke, pipe tobacco’s alkaline smoke, cured by age-old methods, is
(E) The alkaline smoke of pipe tobacco differs from cigarettes’ acid smoke in that it is cured by age-old methods and is
解答本题时首先排除的是D答案，因为differ from不能用在句首。本题的正确答案为C，但是很多考生的目光都是在C上暂作停留就转向其他选项了。原因是C中连用了两个yield，这样的句子毫无美感可言，缺乏变化。可是千万别忘记考虑到句子重心问题，其他几个答案都是把句子重心搞错了，smoke和cigarette对应有误，这可是大禁忌，比起这个错误来，用词重复还算得了什么呢？
GMAT语法题的难度一方面来自题干，另一方面来自选项，因为我们要依靠GMAT语法题选项之间的差别来获得信息、寻求提示，善于运用排除法，挑选出相对准确而有效的那一个才是关键。
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