首页
登录
职称英语
Centuries ago, man discovered that removing moisture from food helps to pre
Centuries ago, man discovered that removing moisture from food helps to pre
游客
2023-11-09
58
管理
问题
Centuries ago, man discovered that removing moisture from food helps to preserve it, and that the easiest way to do this is to expose the food to sun and wind. In this way the North American Indians produce pemmican (dried meat ground into powder and made into cakes), the Scandinavians make stockfish and the Arabs dried dates and "apricot leather".
All foods including water — cabbage and other leaf vegetables contains as much as 93% water, potatoes and other root vegetables 80%, lean meat 75% and fish, anything from 80% to 60%, depending on how fatty it is. If this water is removed, the activity of the bacteria which cause food to go bad is checked.
Fruit is sun-dried in Asia Minor, Greece, Spain and other Mediterranean countries, and also in California, South Africa and Australia. The methods used vary, but in general, the fruit is spread out on trays in drying yards in the hot sun. In order to prevent darkening, pears, peaches and apricots are exposed to the fumes of burning sulfur before drying. Plums, for making prunes, and certain varieties of grapes for making raisins and currants, are dipped in an alkaline solution in order to crack the skins of the fruit slightly and remove their wax coating, so as to increase the rate of drying.
Nowadays most foods are dried mechanically. The conventional method of such dehydration is to put food in chambers through which hot air is blown at temperatures of about 110℃ at entry to about 43℃ at exit. This is the usual method for drying such things as vegetables, minced meat, and fish.
Liquids such as milk, coffee, tea, soups and eggs may be dried by pouring them over a heated steel cylinder by spraying them into a chamber through which a current of hot air passes. In the first case, the dried material is scraped off the roller as a thin film which is then broken up into small, though still relatively coarse flakes. In the second process it falls to the bottom of the chamber as a fine powder. Where recognizable pieces of meat and vegetables are required, as in soup, the ingredients axe dried separately and then mixed.
Dried foods take up less room and weigh less than the same food packed in cans or frozen, and they do not need to be stored in special conditions. For these reasons they are invaluable to the climbers, explorers and soldiers in battle, who have little storage space. They are also popular with housewives because it takes so little time to cook them. Usually it is just a case of replacing the dried-out moisture with boiling water. [br] The open-air method of drying food ______.
选项
A、is the one most commonly used today
B、was invented by the American Indians
C、has been known for hundreds of years
D、tends to be unhygienic
答案
C
解析
细节题。见第一段第一句话。几个世纪前,人们就发现出去食物中的水分有利于食物保鲜。
转载请注明原文地址:http://tihaiku.com/zcyy/3170543.html
相关试题推荐
Centuriesago,mandiscoveredthatremovingmoisturefromfoodhelpstopre
Centuriesago,mandiscoveredthatremovingmoisturefromfoodhelpstopre
Centuriesago,mandiscoveredthatremovingmoisturefromfoodhelpstopre
Afterpeoplehavelearnedthatmagnetsattractthings,centuriespassed______t
Hediscoveredthat______oldfriendofhiswasoneof______membersofthejur
Whatisthesignificanceofthenewlydiscoveredfossils?[br][originaltext]
AnewtypeoforganismdiscoveredinanArctictunnelcametolifeinthel
AnewtypeoforganismdiscoveredinanArctictunnelcametolifeinthel
Accordingtothenews,whofirstdiscoveredthefraud?[originaltext]Police
Tohisgreatjoyhediscoveredthathiscarwasbecoming______.A、sensitiveB、se
随机试题
Onemajorobstacletoeconomicdevelopmentispopulationgrowth.Thepopulat
Nowadaystourismismoreandmoreindispensabletopeople’slife.Butwhich
[originaltext]Afewyearsago,myhusbandandImovedfromCaliforniatoWh
WaystoHandleStressThismaycomeasasurprise,bu
管理人内部控制的作用,描述错误的一项是()A.管理经营风险,提高经营管理效益,
根据《上市公司重大资产重组管理办法》,以下不属于独立财务顾问必须出具持续督导意见
从一个服从正态分布的总体中随机抽取样本容量为n的样本,在95%的置信度下对总体参
对于未完成义务教育的未成年社区服刑人员,社会工作者应当协助联系相关部门,协调并督
阅读下列材料,并结合所学知识回答问题: 材料一: (隋文帝)獨孤皇后
2008年世界稻谷总产量68501.3万吨,比2000年增长14.3%;小麦总
最新回复
(
0
)