3. Acid rain and snow result from the chemical reactions between industrial emissions of sulfur dioxide and nitrogen oxideswith atmospheric water vapor to produce highly corrosive sulfuric and nitric acids.
　　（A）with atmospheric water vapor to produce highly corrosive sulfuric and nitric acids
　　（B）with atmospheric water vapor producing highly corrosive sulfuric and nitric acids
　　（C）and atmospheric water vapor which has produced highly corrosive sulfuric and nitric acids
　　（D）and atmospheric water vapor which have produced sulfuric and nitric acids which are highly corrosive
　　（E）and atmospheric water vapor to produce highly corrosive sulfuric and nitric acids
　　 这道题目的考查对象为between…and…这一常见的固定搭配，用来连接两个名词或名词短语，本题对考生的干扰主要在于sulfur dioxide和nitrogen oxides中间已经出现了一个and，有些考生就想到GMAT语法要求句子简明，那么连用and肯定不合适，首先将C，D和E排除掉了。但是如果用with，整句话逻辑关系不通，这个错误当然要比用词重复严重得多，相比之下还是选择使语意合乎逻辑的选项，正确答案为E。我们不选C和D的理由并不是由于句子不简洁，而是其逻辑关系有误。
　　下面这道题目请考生自己按照上面所提到的思路去分析，不难得出正确答案为D。
　　4. Lacking information about energy use, people tend to overestimate the amount of energy used byequipment, such as lights, that are visible and must be turned on and off and underestimate thatused by unobtrusive equipment, such as water heaters.
　　(A)equipment, such as lights, that are visible and must be turned on and off and underestimate that
　　(B)equipment, such as lights, that are visible and must be turned on and off and underestimate it when
　　(C)equipment, such as lights, that is visible and must be turned on and off and underestimate it when
　　(D)visible equipment, such as lights, that must be turned on and off and underestimate that
　　(E) visible equipment, such as lights, that must be turned on and off and underestimate it when
　　虽然语法改错部分看起来容易把握，但在实际解题过程中，考生经常顾此失彼，在几个选项间徘徊犹豫半天依然难以确定最终答案。GMAT语法改错的难度一方面来自题干，另一方面来自选项，因为我们要依靠选项之间的差别来获得信息、寻求提示，其实这就反映了GMAT语法改错答案的特点，也就是需要我们善于运用排除法，挑选出相对准确而有效的那一个。

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