四六级考试

【单选题】 If two men suspected for some reason they have a common ancestor, ______.
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

网考网参考答案：B
网考网解析：
细节推断题 题干的表遍相当于第三段第二句的“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(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。 查看试题解析出处>>