Mark Twain is mentioned in the passage in order to show that The major difference between Dr. Vink and other geneticists is tha

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问题 Mark Twain is mentioned in the passage in order to show that
The major difference between Dr. Vink and other geneticists is that

选项 A、her research is not based on the study of twins but on questionnaires.
B、her research does not emphasize the contrast between two kinds of twins.
C、her research is interested in the smoking habits of fraternal twins.
D、her research only focuses on the study of the DNA of adult twins.

答案B

解析 事实细节题。文章第三段最后一句说道"她不是对比同卵和异卵双胞胎,而是集中精力于成年异卵双胞胎",证明她的研究并不强调两种双胞胎的对比。
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