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例文：（剑桥真题）
There are technical limitations to the amountof paper which can be recycled and some paper products cannot be collected forre-use. These include paper in the form of books and permanent records,photographic paper and paper which is badly contaminated. The four most commonsources of paper for recycling are factories and retail stores which gatherlarge amounts of packaging material in which goods are delivered, also areoffices which have unwanted business documents and computer output, paperconverters and printers and lastly households which discard newspapers andpackaging material. The paper manufacturer pays a price for the paper and mayalso incur the collection cost.
4. The most important source of paper forrecycling is the factory. （等级：8分）
该题对一般的学生而言正确率只有20%，而该题的主要问题是出在分析文章句子语法结构，首先我们得清楚找到原文做题之前第一步：分析句子语法结构，这跟我们游泳之前先脱掉衣服一样的道理，语法清晰我们才能实施第二步：分析题目。所以通过locating word：factory，我们能定位在该段中第三句子（见黑体字）。第一，找主干： The four most common sources of paper for recycling are factories andretail stores ，also offices and lastly households。剩下三个定语从句。第二，做题：根据主句我们知道原文讲的频率（the most common source…）,而题目考点为重要性（themost important source…）答案基本确定90%为NG，再看从句，没有一个从句是讲谁最重要，所以答案为NG。
该题难点在于分析语法结构，大部分同学知道主语：The four most common sources of paper ,谓语动词：are，而后面的宾语就是问题了，有小部分同学会认为只是factories and retail stores两个，这说明这小部分学生最基本的语法逻辑有问题，因为主语中明明讲的是four most common sources，宾语该有四个。还有大部分学生会认为宾语为：factoriesand retail stores ，also offices and business documents 或者factories and retail stores ，also offices and printers.这部分学生就是大部分学生的语法问题“知道基本语法结构，缺少语法逻辑”，好比：I like four kinds of fruits which are apples, pears, bananas and beef.这一看就知道牛肉不属于水果，很典型的逻辑错误。同理，刚才原文中的4个宾语前三个都是地方，说明第四个也应该是地方，所以为household，而该题在household之前后个lastly，当然有这个次只是一种运气！
所以提速的首要条件就是雅思阅读长难句的语法分析能力：基本语法+逻辑，有了它我们才能深入去探讨其他典型难题！
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