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1、托福阅读句子简化题真题分析在学会确定句子简化题（简称“句简题”）的核心信息后，我们来做一道来自 TPO 31的句简题。题目如下：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. Secon
2、d, it appears that closely related populations of fishes on both sides of the isthmus are starting to genetically diverge from each other. Because Gravesstudy of geographically isolated populations of isthmus fishes offers a glimpse of the beginning of a process of gradual accumulation of mutations
3、that are neutral or adaptive, divergences here might be evidence of allopatric speciation in process.Q12 Which of the sentence below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential info
4、rmation.A. Gravessstudy provides evidence that isthmus fishes are in the process of becoming geographically isolated.B. Gravessstudy of mutating isthmus fishes yields results that differ from results of other studies involving allopatric speciation.C. Gravessstudy of isolated populations of isthmus
5、fishes provides some evidence that allopatric speciation might be beginning.D. Gravessstudy indicates that when isolated, populations of isthmus fishes register neutral or adaptive mutations.1. 首先确定句子核心信息BecauseGravessstudy of geographically isolated populations of isthmus fishesoffers a glimpse of
6、the beginning of a process of gradual accumulation of mutationsthat areneutral or adaptive, 【 divergences here might be evidence of allopatric speciation inprocess.】词汇：A glimpse of看见，瞥见Mutation突变，变种Divergence变化，变异Allopatric speciation异地物种形成2.理解大意该句是由 because 引导的原因状语从句和方括号内的主句组成的嵌套句，从句的主谓宾已用绿色字体标出， 大
7、意为：因为 G的研究让人们看到了突变的逐渐累积过程的开始， 所以这里的变异可能是正在进行中的异地物种形成的证据。 也即是说： G的研究为异地物种形成提供了证据。3.核对选项1A Gravessstudy provides evidence thatisthmus fishes are in the process of becoming geographically isolated.A 选项主句信息缺失B Gravessstudy of mutating isthmus fishes yields results thatdiffer from results ofother studies
8、 involving allopatric speciation.B 选项提到“不同”，而原句未提及C Gravessstudy of isolated populations of isthmus fishes provides some evidencethat allopatric speciation might be beginning.C 选项说到 G 关于鱼的研究为异地物种形成的开始提供了证据，与之前分析的大意一致D Gravessstudy indicates that when isolated, populations of isthmus fishesregister neutral or adaptive mutations.D 选项主句信息缺失所以该题 正确答案为 C。2