There’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. relationship
网友回答
(答案→)A. tradition
B. balance
C. concern
D. relationship
解析：名词辨析。A传统；B平衡；C担心；D关系。根据句意可知A正确。句意：在我们办公室有一个传统。当由人过生日的是偶，他们带一个蛋糕来与大家分享。