GMAT SC中句子改错比较考点详解

在 GMAT-SC 考点中，SC比较考点由于夹杂一些修饰成分和措辞表达，容易让考生感到理解起来比较困难。今天我们和大家分享两道官方题目里涉及比较的题目，希望能够对大家在做题思维上有所启发。

例题一

Like ancient Egyptian architectural materials that were recycled in the construction of ancient Greek Alexandria, so ancient Greek materials from the construction of that city were reused in subsequent centuries by Roman, Muslim, and modern builders. 
（A）.Like ancient Egyptian architectural materials that were recycled in the construction of 
（B）.Like recycling ancient Egyptian architectural materials to construct
（C）.Just as ancient Egyptian architectural materials were recycled in the construction of 
（D）.Just as they recycled ancient Egyptian architectural materials in constructing 
（E）.Just like ancient Egyptian architectural materials that were recycled in constructing

分析总结

点拨：首先like和unlike的比较对象是其后名词和主句主语比， 必须具有可比性，且是比名词。所以原文 like后面的materials和未划线的so ancient Greek materials were reused 是不可比的。未划线so后这一节比的是动作，但是like/unlike后应该比名词。所以原文不对。

其次，B选项里recycling ancient Egyptian architectural materials和未划线的ancient Egyptian architectural materials也是不可比的，仍然不符合like/unlike 的比较规则。

看到C我们清晰了，这也是课上重点讲到的关于as这个词的比较规则：(Just) as a does sth , so does B/so B does.把 just 括起来的原因就是有没有 just 不影响as的比较规则，就像like一样，just like，重点也应该是在like上。

且C是两件事情与事情之间的比较，were recycled 和未划线的 were reused 也是对应的。意为就像古埃及的建筑材料 在建筑中被回收一样古希腊亚历山大，因此，在随后的几个世纪里， 罗马、穆斯林和现代建设者重新使用了该城市建筑中的古希腊材料。逻辑清晰，语义明确。

D选项里代词 they 指代不明，仍然和未划线的内容不可比，我们说多个代词多个鬼，看到代词第一大方向是不会有好感，放在主语的位置更要敏感，会有无指代和指代不明确的嫌疑。C不是最优且对象不可比。SC题目选最优选，CR选最增强最削弱，要谨记。

E选项综上，同理排除，且like和未划线so完全是两家人不可比。

总结：所以此题大家要分清楚like和as的比较原则，且事件于事件之间对比，be动词和be动词对应，肯定是语义更完整的表达和对比。

例题二

Financial uncertainties from the accident at Three Mile Island may prove even more deterring to the nuclear industry than political opposition is.

（A）.from the accident at Three Mile Island may prove even more deterring to the nuclear industry than political opposition is 
（B）.from the accident at Three Mile Island may prove to be even more serious a deterrent to the nuclear industry than political opposition
（C）.from the accident at Three Mile Island may prove to be an even more serious deterrent to the nuclear industry than political opposition 
（D）.resulting from the accident at Three Mile Island may prove to be an even more serious deterrent to the nuclear industry than is political opposition
（E）.resulting from the accident at Three Mile Island may prove even more deterring to the nuclear industry than political opposition

分析总结

点拨：此题重点在于than后面的is非常必要，因为是要突出财务的不确定性对核工业的威慑作用比政治反对派（的威慑作用）更严重。所以正确选项D里的is在这里对应了前面的 be an even more serious deterrent，语义表达严谨，对仗更工整，和上一例题有相似之处。

而原文than后面的is和前面没有概念对应，前面只有 动词的prove且deterring是动词（或分词形式），这里有自己名词形式用自己名词形式，用deterrent即可。B和E都是缺少is这层含义。

总结：所以此题属于原文逻辑有问题，可以重新在 BCDE 里找出正确的句子关系。关于语法层面的措辞不用纠结是 from 引导 的介词短语定语后置修饰 Financial uncertainties 还是分词短语 resulting from the accident定语后置修饰Financial uncertainties， 意思上都能理解的，只不过说 resulting from the accident 修饰财 政不确定性语义更清晰，比直接 from accident 更流畅。 

综上，希望大家对SC里比较题目的比较规则有所感悟，在做题步骤清晰和原文逻辑判断清楚的前提下，结合该考点自身特点和规则，看语义，语义为王。