单项选择题

Some criminals remove their own finger-prints by ______.

A．using printer's ink
B．injuring the inner skin
C．damaging the outer skin
D．damaging the colour
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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
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
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