A、They were common in the United States.B、Only a few people had them.C、People

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问题

选项 A、They were common in the United States.
B、Only a few people had them.
C、People considered them essential.
D、They were not very accurate.

答案 B

解析

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Inthecityofthefuture,theabilitytogetpeoplefrompointAtopointB