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【简答题】
Themajor difference between Dr. Vink and other geneticists is that [ A ] her research is not based on thestudy of twins but on questionnaires. [ B] her research does not emphasize thecontrast between two kinds of twins. [ C ] her research is interested inthe-smoking habits of fraternal twins. [ D ] her research only focuses on thestudy of the DNA of adult twins.
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