2. 外语
  3. People in a large area may possess the same DNA thread because ______ . If two men suspected for some reason they have a common

People in a large area may possess the same DNA thread because ______ . If two men suspected for some reason they have a common

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问题 People in a large area may possess the same DNA thread because ______ .
If two men suspected for some reason they have a common ancestor, ______ .
选项 A、we can decide according to their family tree
B、we can find the truth from their genetic markers
C、we can compare the differences in their Y chromosome
D、we can look for written records to prove their relationship
答案B
解析 细节题。题干的表述相当于第三段第二句：“if two men sharing the same last name believe that they are related”，做题依据是本句的后半句：“we can verify this possibility by collecting a sample of DNA from both and looking for common markers"(我们可以通过采集两个人的DNA样本寻找共同的遗传标记来确定这种可能性)，B项符合此意。C意为“比较他们Y染色体的不同”，并非要强调不同，因此是错误的。
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