Every human being has unique arrangement of skin on his fingers and this arrangement is unchangeable. Scientists and experts hav

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问题     Every human being has unique arrangement of skin on his fingers and this arrangement is unchangeable. Scientists and experts have proved the【C1】______of finger-prints and discovered that no【C2】______similar pattern is【C3】______ from parents to children,【C4】______nobody knows why this is the【C5】______.
    The ridge【C6】______on a person’ finger doesn’t change【C7】______growth and is not affected by【C8】______injuries.
    Burns, cuts and other damages to the【C9】______part of the skin will be replaced【C10】______by a new one which bears the reproduction of the【C11】______ pattern. It is only when the inner skin is injured that the arrangement will be 【C12】______. Some criminals make use of this to【C13】______ their own finger-prints【C14】______this is a dangerous and rare step to【C15】______.
    Finger-prints can be made very easily with a printer’s ink. They can be recorded easily. With special method,【C16】______can be achieved successfully within a short time.【C17】______the simplicity and economy of this system, finger-print have often been used as a method of solving criminal cases. A【C18】______man may deny the charge but this may be【C19】______. His finger-prints can prove who he is even his【C20】______ has been changed by age or accident.
【C14】

选项 A、and
B、but
C、when
D、if

答案B

解析 考查逻辑关系。从逻辑上讲,本题需要一个对比连词,故应选B.but“但是”。
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