What does the text mainly discuss? A. Early conditions in the United States mail service. B. Economic development in the 19"century C. Telecommunication systems in the 1800s. D. Traveling in the United States.

What does the text mainly discuss?
A. Early conditions in the United States mail service.
B. Economic development in the 19"century
C. Telecommunication systems in the 1800s.
D. Traveling in the United States.

出自：乐山师范学院第二外语(英语）

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