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.
【C4】

选项 A、if
B、when
C、though
D、as

答案C

解析 考查逻辑关系。根据语境可知,空格前后存在让步关系。though“尽管”,与句意相符,故正确答案为C.though。if“如果”,引导条件状语从句;when“当…时候”,引导时间状语从句;as可以引导让步状语从句,但需倒装:三项均不符合题意。
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