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托福阅读词汇题：exploited

2015-08-17 17:12:47来源：网络

　　【托福阅读题型：exploited词汇题】托福阅读中词汇题是重要题型之一。根据托福阅读题型不同来进行专项练习，是短期提高托福阅读能力的有效方法。同学们需要多加练习哦!

　　查看全部：托福阅读题型分类练习之词汇题

　　托福阅读词汇题：exploited

　　【Paragraph 2】The source had long been known but not exploited. Early in the eighteenth century, a pump had　come into use in which expanding steam raised a piston in a cylinder, and atmospheric pressure brought it down again　when the steam condensed inside the cylinder to form a vacuum. This “atmospheric engine,” invented by Thomas　Savery and vastly improved by his partner, Thomas Newcomen, embodied revolutionary principles, but it was so slow　and wasteful of fuel that it could not be employed outside the coal mines for which it had been designed. In the 1760s,　James Watt perfected a separate condenser for the steam, so that the cylinder did not have to be cooled at every stroke;　then he devised a way to make the piston turn a wheel and thus convert reciprocating (back and forth) motion into rotary　motion. He thereby transformed an inefficient pump of limited use into a steam engine of a thousand uses. The final step　came when steam was introduced into the cylinder to drive the piston backward as well as forward, thereby increasing　the speed of the engine and cutting its fuel consumption.(Powering the Industrial Revolution)

　　The word “exploited” in the passage is closest in meaning to

　　○utilized

　　○recognized

　　○examined

　　○fully understood

　　The word “vastly” in the passage is closet in meaning to

　　○quickly

　　○ultimately

　　○greatly

　　○initially

　　答案见下一页：

本文关键字: 托福阅读词汇题：promote

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