Here’s a in our office that when it’s somebody’s birthday, they bring in a cake for us all to share.
A. tradition
B. balance
C. concern
D. topic
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(答案→)A. tradition
B. balance
C. concern
D. topic
解析：考查名词词义辨析。A传统；B平衡；C关心；D话题；句意：当别人生日时，他们带蛋糕来与大家分享是我们办公室的一个传统。