单项选择题

It is ______ for a criminal to deny his crime when finger-prints are used to identify him.

A．worth trying
B．successful
C．useful
D．useless
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单项选择题
Finger-prints have often been used as a method of solving criminal case because it ______.
A．is complicated but reliable
B．is simple and not expensive
C．is expensive but easy to do
D．can bring a lot of money
单项选择题
If your fingers are wounded by knife, fire or other means, the structure of skin will ______.
A．be changed partly
B．be replaced by a different one
C．be the same when the wound is recovered
D．become ugly
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