2. 外语
  3. Canals are watercourses constructed to improve and extend natural waterways. They are generally built to facilitate transportati

Canals are watercourses constructed to improve and extend natural waterways. They are generally built to facilitate transportati

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问题      Canals are watercourses constructed to improve and extend natural waterways. They are generally built to facilitate transportation, but from the beginning they have been used for many additional purposes including draining swamps, irrigating land for cultivation, and promoting economic development.
     Canals are often classified by the size of vessel they can accommodate. Some small local canals, which are able to float only 100 to 300 ton boats or small rafts of timber, may be only 3 feet deep. Major barge canals generally range from 6 to 9 feet in depth, and some are as much as 10 or 12 feet deep. These canals can carry 1,350 to 2,000 ton craft. Ship canals are 25 feet or more deep and are capable of accommodating large vessels in the seagoing class.
     Canals may also be classified as either water level or lock canals. Water level canals do not vary in height along their courses. The best known of these is the Suez Canal, which is at sea level. Lock canals, which include most modem waterways, contain locks, or special devices for raising and lowering boats along their courses by changing the depth of the water. Each lock is a stretch of water enclosed by gates at each end. After a boat enters the lock, water is let or drained out until it reaches approximately the same level as the water ahead.
According to the author, in terms of the respect he inspired, Arthur is comparable to______.
选项 A、a modern hero
B、a tribe leader
C、a modem scientist
D、a blacksmith
答案C
解析 该题的提问部分意为：“就他所引起的崇拜而言，亚瑟可以与..相比。”第二段提到，在石器时代末期，掌握了青铜技术的人被人顶礼膜拜，被视为统治精神与物质世界的主(a lord over spiritual and material things)。在那个时代的人眼里 (in eyes of the people of the lron Age)，这种人简直就是先知(seer)，他同今天的发明家、化学家一样，为他的人民创造新的武器。因此，像今天我们崇拜或敬畏科学家一样，那个遥远的时代的人将掌握了青铜技术的人视作他
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