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
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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
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
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