According to the speaker, why was it a problem for mail carriers to cross rivers in the 1600s?

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问题 According to the speaker, why was it a problem for mail carriers to cross rivers in the 1600s?

选项 A、Boats used on rivers were extremely crowded.
B、The current was too swift for boats to cross easily.
C、Bridges were too weak to carry the weight of a stagecoach.
D、Ferry service was infrequent.

答案D

解析 细节题。文中说早在17世纪送信时过河是很大的麻烦,因为渡船的时间没有规律,邮递员有时要等上好几个小时才能坐上船,故D选项意思正确。
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