點(diǎn)擊查看：2019年12月英語四級美文100篇

　　考試吧英語四六級考試網(wǎng)為備考英語四級的同學(xué)們整理了“2019年12月大學(xué)英語四級美文（第五十篇）”，希望可以為大家?guī)�來幫助，一起來學(xué)習(xí)一下吧。

　　英語四級美文：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.

掃描/長按二維碼可幫助通過46級考試

獲取四六級作文預(yù)測

獲取四六級成績查詢

獲取四六級通關(guān)技巧

獲取作文聽力等資料

四六級萬題庫 | 微信搜索"萬題庫英語四六級考試"

　　編輯推薦：

　　2019年12月英語四級作文高分同義替換詞60個

　　2019年下半年英語四六級筆試時間及內(nèi)容 | 考試時間已確定

　　2019年英語四級作文預(yù)測范文 | 2019年大學(xué)英語四級詞匯大全

　　2019年大學(xué)英語四級聽力輔導(dǎo) | 2019年大學(xué)英語四級翻譯習(xí)題

　　歷年英語四級真題及答案匯總 | 歷年英語四級真題聽力(含MP3)

　　大學(xué)英語四級考試萬題庫下載 | 關(guān)注四六級微信 獲取通關(guān)技巧！