Bythe1840stheinfluxofp()totheNorthwest,a

2022-08-03 14:42 现代邮政英语

By the 1840s the influx of p() to the Northwest, and the flood of prospectors to California after 1848 had created an increasing demand for mail delivery to and from the East.(--the first people to go to a particular area in order to live and work there)

正确答案:pioneers
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