GRE阅读把握文章主题
英语课
和国内学生写文章不一样，美国人的阅读文章中从来都不出现“I think that，in my opinion，as far as I am considered”此类语言做主题句。通常来说主题句有以下两种形式：
1. 判断句(含情态动词，系动词，正负褒贬词的句子);
2. 概括文章将来结构。
比如一个句子：Your minds changed my attitude. 这句话中并没有情态动词和系动词，因此这句话自然不是判断句，也就不是主题句。但只要在这句话中加入一个正负褒贬词，即一个词表明作者的态度或观点的词即是判断句了。比如，Your minds successfully changed my attitude即是判断句了。
另外，如果一个句子不是判断句，只要它能够概括文章将来结构，及文章后面会从哪几个方面来说明，也是主题句。比如，People are living longer now. 这句话一定不是主题句，而如果这句话是，People are living longer now since the improvement of food condition and the development of medical technology.这句话即是主题句了。因为它概括了文章后面会从哪几个方向来进行说明。
如果考生在新GRE阅读题中掌握好了主题句判断方法，很多文章便可以很快把握文章的结构框架，帮助后面文章的理解。
比如一篇文章的开头是，Mycorrhizal fungi 1 infect more plants than do any other fungi and are necessary for many plants to thrive， but they have escaped widespread investigation 2 until recently for two reasons. First， the symbiotic 3 association is so well-balanced that the roots of host plants show no damage even when densely 4 infected. Second， the fungi cannot as yet be cultivated in the absence of a living root.
第一句是明显的判断句，即为主题句。而主题句也同时概括了文章的将来结构，即会从“M真菌影响力很强”和“M真菌过去由于两个原因没有得到广泛研究”。下面马上看到了first和second，我们即知道这两个很难读懂的句子无非是两个原因使得M真菌没有得到广泛研究而已，具体是哪两个原因，我们几乎可以忽略不读。
总之，在做新GRE阅读时应该运用一些技巧，这样不仅能提高选对选项的效率，还能节省不少的时间。
n.真菌，霉菌
- Students practice to apply the study of genetics to multicellular plants and fungi.学生们练习把基因学应用到多细胞植物和真菌中。
- The lawn was covered with fungi.草地上到处都是蘑菇。
n.调查，调查研究
- In an investigation,a new fact became known, which told against him.在调查中新发现了一件对他不利的事实。
- He drew the conclusion by building on his own investigation.他根据自己的调查研究作出结论。
adj.共栖的，共生的
- Racing has always had a symbiotic relationship with betting.赛马总是与赌博相挂钩。
- Engineering completely new symbiotic relationship is obviously not an imminent possibility.筹划完全新的共生关系显然是可能性不大。
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