孙吉芯：List of Headings题型全面解析_雅思英语阅读

孙吉芯：List of Headings题型全面解析

　　E How far does other research support these conclusions Geneticist Douglas Wallace has studied mitochondrial DNA in blood samples from three widely separated Native American groups: Pima- Papago Indians in Arizona, Maya Indians on the Yucatan peninsula, Mexico, and Ticuna Indians in the Upper Amazon region of Brazil. As would have been predicted by Robert Williamss work, all three groups appear to be descended from the same ancestral population.

　　F There are two other kinds of research that have thrown some light on the origins of the Native American population; they involve the study of teeth and of languages. The biological anthropologist Christy Turner is an expert in the analysis of changing physical characteristics in human teeth. He argues that tooth crowns and roots have a high genetic component, minimally affected by environmental and other factors. Studies carried out by Turner of many thousands of New and Old World specimens, both ancient and modern, suggest that the majority of prehistoric Americans are linked to Northern Asian populations by crown and root traits such as incisor shoveling , single-rooted upper first premolars6 and triple-rooted lower first molars.

　　ii Dental evidence

　　iii Greenberg`s analysis of the dental and linguistic evidence

　　section E 的解法也类似，paragraph E 中开头就是一个问句。在考试中遇到问句，考生需要把问句本身和回答问句的句子一并仔细阅读。这两句话和vi选项分别有 further和 how far does other，genetic evidence 和 DNA 两对同义替换词。考生在这种情况下可以很肯定的选择Vi。 section F的题目设计较新也比较狡猾。大家通过阅读F段可以很快找到文章的前两句话中与III选项中分别有language和linguistics, teeth和dental evidence两对同义替换词，很多同学会很坚定的选择III。很可惜，本题的正确答案是II。前文中我们提过，II 和 III选项较为类似，不同的是III中包含了Greenberg 这个人名也多出了linguistic这个信息。 III选项错误的原因就是 Greenberg这个人物在文中只是个语言学家没有研究过牙科证据，而这一信息恰恰出现在文章中唯一不需要阅读的最后一段。所以，本题题目的设计是相当精妙的。考生不但要选择出能概括段落的选项，还不能忘记所选答案一定要是正确的。