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They switched m（） every 10-12 miles.（－－a horse that you ride on）
They switched m（） every 10-12 miles.（--a horse that you ride on）
正确答案：mounts
标签：
现代邮政英语
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Later this route was ultimately j（） by growing North-South tension.（－－cause sth.to be harmed, lost or destroyed; put in danger）
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This relay system allowed mail to criss-cross the f（） in record time.（－－the edge of land where people live and have built towns, beyond which the country is wild and unknown, especially in the western US in the 19th century）