写作要有备而来，这个“备”是指背诵，直接背文章任务量会比较大，而且素材太多，每种类型都背一遍也不太现实。所以建议大家背好话题关键词。通常大家都会背诵一些作文模板句和常用素材，考场上再结合主题自己写一些，此时能利用上这些关键词就能成为你作文的一大亮点。今天文都四六级和大家分享2020年6月大学英语四级作文美文：The Origin of the Refrigerators，希望对您有所帮助。
大学英语四级作文美文：The Origin of the Refrigerators
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.