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To help the blind, young Louis Braille created a system _________ six raised dots representing diffe...
题目内容：
To help the blind, young Louis Braille created a system _________ six raised dots representing different letter; _____ the blind can easily recognize Brail with the fingers now.
A.made up of; but B.consisted of; thus
C.making up of; but D.consisting of; thus
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