A post office should be built in a central for the sake of the convenience.
A. position
B. situation
C. eruption
D. connection
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(答案→)A. position
B. situation
C. eruption
D. connection
解析:A. position位置,B. situation形势,处境, C. eruption爆炸,D. connection连接,句意:为了方便,邮局应该建立在一个中心位置。所以选A。