2. 外语
  3. People in a large area may possess the same DNA thread because ______ . The possible research of family trees is based on the f

People in a large area may possess the same DNA thread because ______ . The possible research of family trees is based on the f

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问题 People in a large area may possess the same DNA thread because ______ .
The possible research of family trees is based on the fact that ______ .
选项 A、genetics has achieved a breakthrough
B、genetic information contained in DNA can be revealed now
C、each individual carries a unique record of who ho is and how he is related to others
D、we can use DNA to prove how distant an individual is to a family, a group or a population
答案C
解析 推断题。基于第一段第二、三句，我们知道遗传标记提供独有的识别特征(unique identification)把人们连接在一起，形成家谱。换句话说，能对家谱进行研究，是因为遗传标记的独有特征可以用来判断一个人的基因身份以及与他人之间的关系，C项正确。A意为“遗传学取得突破”；B意为“包含在DNA中的基因信息现在可以揭示出来”，都没有回答进行家谱研究依据什么基础；而D项强调“用DNA证明有多遥远”与文章不符。
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