单项选择题

The British DNA database is established to ______.

A．find the identical DNA profiles
B．help criminal investigations
C．store people's personal information
D．treat people of potential diseases
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单项选择题
The passage is mainly about ______.
A．the discovery of fingerprinting by Jeffery
B．the practice of fingerprinting in court
C．the fingerprinting in the present situation
D．the merits and demerits of fingerprinting
单项选择题
The significance of the DNA fingerprinting is that ______.
A．the patterns of genetic material are unique in everybody
B．it can be used to identify criminals by testing their DNAs
C．DNA testing can tell the wanted information of some people
D．DNA testing can help those who are wrongly accused
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