单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Sit where she is.
B．Sit where there is a breeze.
C．Extinguish his cigarette.
D．Move to another part of the plane.
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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
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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