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6月英语四级优秀作文

时间：2024-06-27 12:43:48 英语四级作文我要投稿

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6月英语四级优秀作文范文

　　在平时的学习、工作或生活中，大家一定都接触过作文吧，作文一定要做到主题集中，围绕同一主题作深入阐述，切忌东拉西扯，主题涣散甚至无主题。那么你知道一篇好的作文该怎么写吗？下面是小编帮大家整理的6月英语四级优秀作文范文，欢迎阅读与收藏。

6月英语四级优秀作文范文

　　The Origin of the Refrigerators

　　By the mid-nineteenth century,the term icebox had entered the American language,but ice was still only beginning to affect the diet of ordinary citizens in the United States.The ice trade grew with the growth of cities.Ice was used in hotels, taverns, and hospitals,and by some forward-looking city dealers in fresh meat,fresh fish, and butter.

　　After the Civil War (1861-1865),as ice was used to refrigerate freight cars,it also came into household use.Even before 1880 half of the ice sold in New York,Philadelphia, and Baltimore,and one-third of that sold in Boston and Chicago,went to families for their own use.

　　This had become possible because a new household convenience,the icebox, a precursor of the modern refrigerator,had been invented.Making an efficient icebox was 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.The commonsense notion that the best icebox was onethat 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 centurydid inventors achieve the delicate balance of insulation and circulation needed for an efficient icebox.But as early as 1803, an ingenious Maryland farmer,Thomas Moore, had been on the right track. When he used an icebox of his own design to transport his butter to market,his butter, still fresh and hard in neat,was worth one-pound a brick.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.

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