四级完形填空(含答案解释)—ClozeTest20免费下载
rallel 1 the coast.Even in the twentieth century, goods can be moved more cheaply by boat than by any other 2 of transport.These
3 make it possible for boats to travel 4 ports along the coast without being 5 to the dangers of the open.Some canals, such as the Suez and the Panama, save
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