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

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.
【C19】
选项 A、out of case
B、in vain
C、at random
D、in question
答案B
解析 考查惯用搭配。B．in vain(=without the desired result)“徒劳，白辛苦”，符合题意，为正确答案。out of use“不再使用”；at random“任意的，随意的”；in question“考虑之中的，谈论着的”，均不符合题意。
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