2. 外语
  3. Today, most countries in the world have canals. Many countries have built canals near the coast, and parallel【C1】______the coast

Today, most countries in the world have canals. Many countries have built canals near the coast, and parallel【C1】______the coast

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问题     Today, most countries in the world have canals. Many countries have built canals near the coast, and parallel【C1】______the coast. Even in the twentieth century, goods can be moved more cheaply by boat than by any other【C2】______of transport. These【C3】______make it possible for boats to travel【C4】______ports along the coast without being【C5】______to the dangers of the open. Some canals, such as the Suez and the Panama, save ships weeks of time by making their【C6】______a thousand miles shorter. Other canals permit boats to reach cities that are not【C7】______on the coast; still other canals【C8】______lands where there is too much water, help to【C9】______fields where there is not enough water, and【C10】______water power for factories and mills. The size of a canal【C11】______on the kind of boats going through it. The canal must be wide enough to permit two of the largest boats using it to【C12】______each other easily. It must be deep enough to leave about two feet of water【C13】______the keel of the largest boat using the canal. When the planet Mars was first【C14】______through a telescope, people saw that the round disk of the planet was crises-crossed by a【C15】______of strange blue- green lines. These were called "canals"【C16】______they looked the same as canals on earth【C17】______are viewed from an airplane. However, scientists are now【C18】______that the Martian phenomena are really not canals. The photographs【C19】______from space-ships have helped us to【C20】______the truth about the Martian “canals”.
【C5】
选项 A、revealed
B、exposed
C、opened
D、shown
答案B
解析 词义辨析题。expose意为“使暴露、面临”，常与介词to连用，表示“暴露于…之中”，符合句意，所以 B正确oreveal意为“显示，揭露”，常用于表示秘密、真相等被揭露；show意为“展示”；open意为“打开”，均排除。
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大学英语四级

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