Most people usually traveled by ship and trainwhich are driven by steam engine. It played animportant part in many kinds of vehicles severalscores of years ago. Who invented steam engine andwhat units could be used to measure the power ofengine?

　　The word “horse-power” was first used twohundred years ago. James Watt from a worker?sfamily made the world first widely used steam engine. At first, he couldn?t tell people howpowerful it was, because there were no units at that time. Watt decided to find out how muchwork one strong horse could do in one minute. He named that unit one horse-power. In this wayhe could measure the work of his steam engine.

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　　He discovered that a horse could lift a 3300-pound weight 10 feet into the air in oneminute. His engine could lift a 3300-pound weight 100 feet in one minute. Because his enginedid ten times as much work as the horse, Watt called it a ten horse-power engine.

　　31. The main idea of the passage is ___.

　　A. James Watt invented the steam engine

　　B. James Watt first used horse-power as a unit of measure

　　C. how much power does a horse have

　　D. why Watt?s engine is called a ten horse-power engine

　　32. The story says that Watt made the first ____.

　　A. engine B. horse-power engine C. useful engine D. widely used steam engine

　　33. James Watt was born in ____.

　　A. a worker?s family B. a farmer?s family C. a teacher?s family D. a doctor?s

　　steam engine

　　34. Watt wanted to find a way to ____.

　　A. measure the work his engine could do B. tell people how powerful his engine was C. lifta 3300-pound weight D. both A and B

　　35. One horse-power means the ____.

　　A. work a horse could do in a minute B. weight a horse could do in ten minutes C. work ahorse could do in ten minutes D. weight of one horse

　　答案

　　31.B　32.D　33.A　34.D　35.A

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