Today, most countries in the world have
canals. Some canals, such as the Suez or the Panama, {{U}} (31)
{{/U}}ships weeks of time by making their voyage a thousand miles shorter.
Other canals permit boats to reach cities that are not located on the coast.
{{U}} (32) {{/U}}other canals drain lands where there is too much water,
help or{{U}} (33) {{/U}}fields where there is not enough
water. The{{U}} (34) {{/U}}of a canal depends on the kind of boats going through it. The canal must be wide enough to permit two of the{{U}} (35) {{/U}}boats using it to{{U}} (36) {{/U}}each other easily. It must be deep enough to leave about two feet of water{{U}} (37) {{/U}}the keel of the largest boat using the canal. Some canals have sloping sides, while others have sides that are nearly{{U}} (38) {{/U}}. Canals that are cut through rock can ha A. disperse B. drain C. irrigate D. flood 更多"Today, most countries in the world "的相关试题: [单项选择] Text
Today, most countries in the world have canals. Many countries have built canals near the coast, and parallel (26) the coast. Even in the twentieth century, goods can be moved more cheaply by boat than by any other (27) of transport. These (28) make it possible for boats to travel (29) ports along the coast without being (30) to the dangers of the open. Some canals, such as the Suez and the Panama, save ships weeks of time by making their (31) a thousand miles shorter. Other canals permit boats to reach cities that are not (32) on the coast, still other canals (33) lands where there is too much water, help to (34) fields where there is not enough water, and (35) water power for factories and mills. The size of a canal (36) on the kind of boats going through it. The canal must be wide enough to permit two o A. off B. with C. to D. by 我来回答: 提交
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