The Zip Code, the numerical system, was publicized in ______. From the passage we may infer that the smallest delivery unit in

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问题 The Zip Code, the numerical system, was publicized in ______.
From the passage we may infer that the smallest delivery unit in the postal system in U.S.A.is a ______.

选项 A、a state.
B、delivery station.
C、a geographical area.
D、metropolitan post office.

答案B

解析
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