You have to be accurate in this job,because a small mistake can make a big .
A. difference
B. difficulty
C. trouble
D. change
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(答案→)A. difference
B. difficulty
C. trouble
D. change
解析:考查名词:A.difference不同B.difficulty困难C.trouble麻烦 D.change改变,make a big difference有很大影响。句意:做这个工作要精确,因为一点的错误都会产生很大影响。选A。