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 phrase stumbled upon (Line 1 ,Para. 1) is closest in meaning to ______ .
A．discovered after great efforts
B．found out quite by chance
C．amazed and confused by
D．invented in experiments
单项选择题
By saying DNA testing is not an unfailing proof of identity , the author means
A．DNA testing can be wrong in its practices
B．there are identical patterns of genetic material
C．many people have the identical DNA profiles
D．DNA testing are endangering people's privacy
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