2012年12月英语六级考前终极预测3套题+答案!.doc

2012年12月英语六级考前终极预测3套题+答案! 导读：就爱阅读网友为您分享以下“2012年12月英语六级考前终极预测3套题+答案!”的资讯，希望对您有所帮助，感谢您对92的支持! Making an efficient icebox as not as easy as we might now suppose. In the early nineteenth century, the knowledge of the physics of heat, which was essential to a science of refrigeration, was rudimentary(未发展的). The commonsense notion that the best icebox was one that prevented the ice from melting was of course mistaken, for it was the melting of the ice that performed the cooling. Nevertheless, early efforts to economize ice included wrapping up the ice in blankets, which kept the ice from doing its job. Not until near the end of the nineteenth century did inventors achieve the delicate balance of insulation and circulation needed for an efficient icebox. But as early as 1803, and ingenious Maryland farmer, Thomas Moore, had been on the right track. He owned a farm about twenty miles outside the city of Washington, for which the village of Georgetown was the market center. When he used an icebox of his own design to transport his butter to market, he found that customers would pass up the rapidly melting stuff in the tubs of his competitors to pay a premium price for his butter, still fresh and hard in neat, one-pound bricks. One advantage of his icebox, Moore explained, was that farmers would no longer have to travel to market at night in order to keep their produce cool. 47. What is the topic of the passage? 48. Where was ice used after the Civil War? 49. What was essential to a science of refrigeration according to the passage? 50. It can be inferred from the passage that the theoretical foundation of ice box should be that ________.