学托福的小伙伴们应该对逻辑关系并不陌生，在阅读中常见的逻辑关系有：因果，转折，对比，还有并列下面我们就以一道例题为例来看一看逻辑关系时怎么样在句子简化题中发挥威力的吧。

　　The extreme seriousness of desertification results from the vast areas of land and the tremendous numbers of people affected, as well as from the great difficulty of reversing or even slowing down the process.

　　A. Desertification is significant problem because it is so hard to reverse and affects large areas of land and great numbers of people.

　　B. Slowing down the process of desertification is difficult because of population growth that has spread over large areas of land

　　C. The spread of deserts is considered a very serious problem that can be solved only if large numbers of people in various countries are involved in the effort.

　　D. Desertification is extremely hard to reverse unless the population is reduced in the vast areas affected.

　　大家可以看到在这道题目当中，在题干部分是有result from这个表示因果逻辑关系的词的，根据逻辑关系对应一致原则，我们在所选的选项当中应该也有表示逻辑关系的词才可以，所以我们会只剩下A和B选项，因为他们里面分别含有because，和because of两个表示逻辑关系的词。而接下来我们就是要分别对应句子的结果部分和原因部分了。这个句子的结果说的是the extreme seriousness of desertification对应A选项里的desertification is significant problem，而B选项中的主语则是对应的原句子中的原因部分，所以这道题就选A啦。

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