单项选择题

Before DNA fingerprinting is used, suspects ______.

A．would have to leave their fingerprints for further investigations
B．could easily escape conviction of guilt
C．would have to submit evidence for their innocence
D．could be convicted of guilt as well
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单项选择题
The 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
单项选择题
According to the passage, DNA fingerprinting can be unreliable when ______.
A．the methods used of 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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