VII Long-standing questions about prehistoric migration to America
Ix Questions about the causes of the prehistoric migration to America
大家会发现文章B段的第一句话读完之后并不能帮助我们解题。考生稍加观察就会发现在本段的后半部分有两个很明显的问句。很显然,能够很好的概括问句的词就是 questions.但是文章中关于questions的选项有VII 和IX两个。对于相似的选项大家可以通过进一步的比较找出区别。在这两个选项中,VII选项中包含了long-standing长期遗留的,而IX选项中有核心词 causes。仔细阅读文章中两个问句考生会发现原文并没有提及任何的原因。所以答案很显然是VII。
C An important project, led by the biological anthropologist Robert Williams, focused on the variants of one particular protein immuneoglobin G- found in the fluid portion of human blood. All proteins drift, or produce variants, over the generations, and members of an interbreeding human population will share a set of such variants. Thus, by comparing the Gmallotypes of two different populations , one can establish their genetic distance, which itself can be calibrated to give an indication of the length of time since these populations last interbred.
x How analysis of blood-variants measures the closeness of the relationship between different
Sectionc中涉及的C落段落结构较为特殊。考生们很快会发现在文章的最后部分出现了thus这一表示总结的单词,那么这句话会是阅读的重点部分。最后一句话词汇难度较高,很多同学会很难读懂。在看不懂原文句子的具体意思时,大家可以采取寻找替换词的方式解题。例如本段的后半部和X选项中出现了 closeness和distance, relationship 和populations last interbred这对同意替换词。那么答案选X也就顺理成章了。
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