单项选择题

National Academy of Sciences holds the stance that ________.

A．DNA testing should be systematized
B．only authorized laboratories can conduct DNA testing
C．the academy only is authorized to work out standards for testing
D．the academy has the right to accredit laboratories for DNA testing

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单项选择题

Before DNA fingerprinting is used, suspects ________.

A．would have to leave their fingerprints for further investigations
B．would have to submit evidence for their innocence
C．could easily escape conviction of guilt
D．could be convicted of guilt as well

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