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 color
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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
Scientists and experts have proved that the pattern of a human being's finger skin ______.
A．is similar to his mother's
B．is valuable to himself only
C．is like that of others with the same type of blood
D．is different from that of all others
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