The ridge(隆起)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 a new one,which bears a reproduction of the original pattern.　2　Some criminals make use of this fact to remove their own fingerprints but this is a dangerous and rare step to take. 

　　Fingerprints can be made very easily with the printer’s ink.They can be recorded easily.　3　 Because of the simplicity and economy of this system,fingerprints have often been used as a method of solving the criminal case.A suspected man may deny a charge but this may be in vain.　4　 When a suspect leaves fingerprints behind at the scene of a crime,they are difficult to detect with the naked eye.　5　 Some of the marks found are incomplete but identification is possible if a print of a quarter of an inch square can be obtained. 

　　A.Special techniques are used to “develop” them.

　　B.A fingerprint is an impression of the ridge structure.

　　C.It is only when the inner skin is injured that the arrangement will be destroyed.

　　D.With special methods,identification can be achieved successfully within a short time.

　　E.Some criminals may leave their fingerprints at the scene of a crime.

　　F.His fingerprints can prove who he is even if his appearance has been changed by age or accident.

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