It is mon to give children and the seniors some lucky money on the eve of the Spring Festival.
A. practice
B. reality
C. knowledge
D. belief
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(答案→)A. practice
B. reality
C. knowledge
D. belief
解析：考查名词：A．practice做法，B． reality现实，C．knowledge知识，D．belief信念，句意：在除夕夜给孩子和老人压岁钱是惯例。Common practice惯例，选A。