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To people's astonishment, the effort to bring the quarreling couple together again ______.

A．came off
B．came on
C．came round
D．came down

单项选择题Which of the following best expresses the author's main concern

A．Photography as a fine art.
B．Modernism and Expressionism.
C．Photographers' attitude toward art.
D．Methods of modern photographers.

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

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 beyond dispute 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

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