2. 外语
  3. The postal zoning system in the United States began in 1943 with the introduction of the one or two digit zone number. These num

The postal zoning system in the United States began in 1943 with the introduction of the one or two digit zone number. These num

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问题     The postal zoning system in the United States began in 1943 with the introduction of the one or two digit zone number. These numbers identified a delivery station of a metropolitan post office. On July 1, 1963,Mr Zip introduced the Zone Improvement Plan. This was a five digit national coding system used to identify each postal delivery section. The first digit identifies one of ten geographical areas, with the second digit denoting a state, part of a heavily populated state, or two or three less populated states. The third digit designates a major metropolitan postal facility or sectional center, with the fourth and fifth digits picking up the original zone number.
    The Federal German Post Office became the first to use the current postal code system to speed delivery. The function of a code system is to help in address scanning and the automated processing of mail, and to speed up mail sorting. Approximately 97 percent of all mail delivered in the United States uses the Zip Code, m 1974, me United States Postal Service issued a postage stamp to publicize me numerical system.
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 由文章的第一、二句，我们可以得出最小的传递单位只是一个传递站。故正确的答案为B。
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