单项选择题

A．Customs officer and traveler.
B．Shop assistant and customer.
C．Repairman and customer.
D．Postman and customer.
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单项选择题
DNA fingerprinting can be unreliable when ______.
A．the methods used for blood-cell calculation are not accurate
B．two different individuals of the same ethnic group may have the same DNA fingerprinting pattern
C．a match is by chance left with fingerprints that happen to belong to two different individuals
D．two different individuals leave two DN samples
单项选择题
To geneticists like Lewontin and Hartl, the current method ______.
A．is not so convincing as to exclude the likelihood that two DNA samples can never come from two individuals
B．is arguable because two individuals of the same ethnic group are likely to have the same DNA pattern
C．is not based on adequate scientific theory of genetics
D．is theoretically contradictory to what they have been studying
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