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  3. The author cites the example of Mark Twain to show that What can be inferred from the third paragraph?

The author cites the example of Mark Twain to show that What can be inferred from the third paragraph?

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问题 The author cites the example of Mark Twain to show that
What can be inferred from the third paragraph?
选项 A、The fraternal twins are much more valued by researchers.
B、Two kinds of twins are often been compared in research.
C、Identical twins are more likely to be addicted to smoking.
D、Fraternal twins are more genetically similar than identical twins.
答案B
解析 本题问从第三段可以推理出什么?文章第三段第一句指出，"The Netherlands Twin Register is voluntary database that is prized by geneticists because they allow the comparison of identical twins with fraternal twins"．意思是由于这个数据库提供了将双方进行对比的信息，所以遗传学家很重视。说明了一个前提，即把两种双胞胎进行对比是常见的科研手段，所以"两种双胞胎在研究中常常被对比"正确。异卵双胞胎更受研究人员的重视：过度推理，研究者不采取常规的将两种双胞胎进行对比的方法，只研究异卵双胞胎，这是因为这项研究本身的需要，但不能得出研究人员更重视他们的普遍结论。同卵双胞胎更容易产生烟瘾：文中未提到。异卵双胞胎比同卵双胞胎在基因上更相同：与文意相反，同卵双胞胎基因的相同率为100%，异卵双胞胎基因的相同率为50%。
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