为了提高
【例】TPO31 Speciation in Geographically Isolated Populations最后一段：
Graves drew two conclusions from these observations. First, at least some of the observed differences between the enzymes of the Atlantic and Pacific fish populations were not random but were the result of evolutionary adaptation. Second, it appears that closely related populations of fishes on both sides of the isthmus are starting to genetically diverge from each other. Because Graves’ study of geographically isolated populations of isthmus fishes offers a glimpse of the beginning of a process of gradual accumulation of mutations that are neutral or adaptive, divergences here might be evidence of allopatric speciation in process.
【解析】这是一道托福阅读六选三题目
很多同学刚看到这一段会很开心，因为第1句说Graves得到了两个结论。于是很自然的会以为这个段落是总分结构，后面会讲结论一、结论二，于是第1句就是这一段的主旨。
But!!!两个结论仅仅到第3句就结束了，第4句顺承前3句，进一步的讲，由于Graves得到的证据，因而表明了物种形成的开始。所以第4句才是本段主旨。也正是这个原因，这篇文章最后一道六选三其中一个正确选项就是“Graves’s study of fish populations separated by the Isthmus of Panama may well provide a picture of the beginning stages of speciation.”(Graves的研究提供了物种形成初始阶段的观察)。
那么什么才是归纳文章或段落主旨的正确打开方式呢?或者说，怎么才能做对最后的六选三，排除其中的细节选项呢?
方法只有一个——利用3s阅读法(survey略读，skimming浏览，scanning扫读)和句间关系。
利用这两招，上面的段落就可以看成两句话：前3句组合成一个大句子，讲两个结论;第2句就是原文第4句，讲Graves的结论的意义。两个大句子之间是顺承关系，重点在后面，所以主旨就是最后一句。
以上就是小编为你带来的托福阅读六选三题型练习及方法解析，更多精彩敬请关注网，预祝托福备考的小伙伴们在托福考试中都能取得理想成绩!