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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单项选择题
The attitude of the Federal Bureau of Investigation shows that ________.
A．enough data are yet to be collected from various ethnic groups to confirm the unlikelihood of two DNA samples coming from two individual members
B．enough data of DNA samples should be collected to confirm that only DNA samples from the same person can match
C．enough data are yet to be collected from various ethnic groups to determine the likelihood of two different DNA samples coming from the same person
D．additional samples from various ethnic groups should be collected to determine that two DNA samples are unlikely to come from the same person
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 DNA samples
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