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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
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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)
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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)