单项选择题

If two men suspected for some reason that 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
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单项选择题
According to the author, the last paragraph mainly deals with______.
A．how French-style language police has prevented the influence of English
B．how Japanese Foreign Words Committee prevents the infection of foreign words
C．the suitable Japanese replacements
D．why committee members and traditionalists launch a war against the infection of foreign words
单项选择题
The possible research of family trees is based on the fact that ______.
A．genetics has achieved a breakthrough
B．genetic information contained DNA can be revealed now
C．each individual carries a unique record of whom he 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
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