The word horsepower was first used two hundred years ago. James Watt had made

游客2023-10-04  27

问题    The word horsepower was first used two hundred years ago. James Watt had made the world’s first widely used  (11)  . He had no way of telling people exactly how powerful it was, for  (12)  there were no units for measuring power.
   Watt decided to find out how much work one strong horse could do in  (13)  . He called that unit one horsepower. With this unit he could measure the work his steam engine could do.
   He discovered that a horse lift a  (14)  weight 10 feet in one minute. Because his engine did  (15)  as much as the horse, Watt called it a ten-horsepower engine.
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The word horsepower was first use two hundred years ago. James Watt had made the world’s first widely used steam engine. He had no way of telling people exactly how powerful it was, for at that time there were no units for measuring power.
   Watt decided to find out how much work one strong horse could do in one minute. He called that unit one horsepower. With this unit he could measure the work his steam engine could do.
   He discovered that a horse lift a 3300-pound weight 10 feet in one minute. Because his engine did ten times as much as the horse, Watt called it a ten-horsepower engine.

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解析 该题测试听懂时间状语的能力。这里需要填写表示过去时间的介词短语。从上下文中可以判断,这是表示过去时间的短语。因此通过听清发音就可以很容易判断出答案。
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