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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 【B1】______ of finger-prints and discovered that no 【B2】______ similar pattern is【B3】______ from parents to children, 【B4】______ nobody knows why this is the【B5】______.
    The ridge 【B6】______ on a person’ finger doesn’t change 【B7】______ growth and is not affected by 【B8】______ injuries, Burns, cuts and other damages to the【B9】______part of the skin will be replaced【B10】______by a new one which bears the reproduction of the【B11】______pattern. It is only when the inner skin is injured that the arrangement will be【B12】______. Some criminals make use of this to【B13】______their own finger-prints【B14】______this is a dangerous and rare step to【B15】______.
    Finger-prints can be made very easily with a printer’s ink. They can be recorded easily. With special method,【B16】______can be achieved successfully within a short time.【B17】______the simplicity and economy of this system, finger-print have often been used as a method of solving criminal cases. A【B18】______man may deny the charge but this may be【B19】______. His finger-prints can prove who he is even his【B20】______has been changed by age or accident.
【B4】
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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