Every human being has a unique (唯一的) arrangement of the skin on his fingers and this arrangement is unchangeable. Scientists and experts have proved the uniqueness of finger-prints and discovered that no exactly similar pattern is passed on from parents to children, though nobody knows why this is the cage.
The ridge (脊状) structure on a person's fingers does not change with growth and is not affected by surface injuries. Burns, cuts and other damage to the outer part of the skin will be replaced in time by new one which bears a reproduction of the original pattern. It is only when the inner skin is injured that the arrangement will be destroyed. Some criminals make use of this fact to remove their own finger-prints but this is a dangerous and rare step to take.
Finger-prints can be made very easily with printer's ink. They can be recorded easily. With special methods, identification (识别) can be achieved successfully within a short time. Because of the simplicity and economy of this system, finger-prints have often been used as a method of solving criminal case. A suspected man may deny a charge but this may be in vain. His finger-prints can prove who he is even if his appearance has been changed by age or accident.
When a suspect leaves finger-prints behind at the scene of a crime, they are difficult to detect with the naked eye. Special techniques are used to "develop" them. Some of the marks found are incomplete but identification is possible if a print of a quarter of an inch square can be obtained.
60. 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
61. 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
62. Finger-prints have often been used as a method of solving criminal ease. 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
63. 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