首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
What is the percentage of the sugar used as food?
What is the percentage of the sugar used as food?
admin
2014-09-18
66
问题
What is the percentage of the sugar used as food?
Sugar is so much a part of our modern life that we only really think about it when, for some reason, we cannot obtain it. It has been known to man for at least 3,000 years, but has come into common use only in modern times. Until quite recently it was considered as a medicine and as a luxury for the very rich only.
Sugar is, then, very important to our civilization. But what exactly is it? Of course, most of us recognize sugar immediately as the sweet material that we put in coffee or cakes. This common form of sugar is derived from two plants: the sugar cane (a type of grass which grows to a height of twenty feet) and the sugar Beet (which grows underground). But there are in fact many types of sugar, and the chemist recognizes hundreds of different varieties, each coming from a different source.
About 90% of the sugar is produced as food. Only 10% is used in industry for purposes other than food production. Yet sugar has great possibilities for use as the basis of chemicals. It can even be used for making plastics. In the future these potential uses will certainly be developed more than in the past.
There are many reasons why we should increase the production of sugar. Most important is that it is one of the most highly concentrated of energy foods. Thus sugar cane and beet produce an average of 7,000,000 calories per a-ere. In this way they have the advantage over potatoes, which give only 4,000,000, while figure for wheat and beans, is 2,000,000 each. So three acres of land growing wheat and potatoes give only slightly more energy than one acre of sugar.
选项
A、3,000 years ago.
B、In modem times.
C、Quite recently.
D、300 years ago.
答案
B
解析
原文中提到:“It has been known to man for at least 3,000 years,but has come into common use only in modern times.”,答案一目了然。
转载请注明原文地址:https://kaotiyun.com/show/pvTK777K
0
专业英语四级
相关试题推荐
Adsaredesignedtohaveaneffectwhile______at,belittled,andallbutignored.
JazzisAmerica’scontributiontopopularmusic.(1)______classicalmusic,whichfollowsformalEuropeantraditions,jazzis(2)_
TVissooftenaparent’sgoodfriend,keepingkidshappilyoccupiedsothegrownupscancookdinner,answerthephone,ortake
Whichofthefollowingsentencesconsistsofsubjunctivemood?
Cultureinfluencesanindividual’shealthbeliefs,behaviours,activitiesandmedicaltreatmentoutcomes.(1)______thesignifica
Anyacademicbreakthrough,______,doesnotautomaticallyensurethatitcanbeappliedtopractice.
SputnikIwasthefirstartificialsatellite.Itcanbedescribedasanaluminum(1)______withadiameterof58centimetersand
Hawaii’snativeminorityisdemandingagreaterdegreeofsovereigntyoveritsownaffairs.Butmuchofthearchipelago’spoliti
Almost60%offive-year-oldsinsomeofBritain’spoorestareasdonotreacha"goodlevel"ofbehaviourandunderstanding—doubl
Ah,praise.SopowerfularesimplewordsofapprovalandadmirationthatthelatepsychologistB.F.Skinneroncecalledpraise
随机试题
防范外汇风险成本的问题应考虑的因素。
以工序为编制对象的定额( )。
2009年5月,菜市财政局派出检查组对2007~2008年度的会计工作进行检查。检查中了解到以下情况:会计王某2007年6月取得会计从业资格证书并从事会计工作至今,未办理注册登记。甲公司2008年7月以来的现金日记账和银行存款日记账没有完全
国际收支理论主要有()。
王老师在讲到中国古代建筑的时候,没有在教室上课,而是带领着学生参观了北京故宫、天坛等建筑。这是美术教学中哪种组织形式?()
连接下列相应内容。①管子①《雨打芭蕉》②古筝②《江河水》③柳琴③《渔舟唱晚》④江南丝竹④《春到沂河》⑤广州音乐⑤《中花六板》
一、注意事项1.申论考试,与传统作文考试不同,是对分析驾驭材料的能力与对表达能力并重的考试。2.仔细阅读给定的资料,按照后面提出的“作答要求”依次作答。二、给定资料1.俗话说,“有收没收在于水,收多收少在于肥”。在我国粮食生产
桥梁:河岸
设有学生表文件,要查找学生表中还没有输入姓名的记录,则SQL语句为:SELECT*FROM学生表WHERE姓名______
Wherearethespeakers?
最新回复
(
0
)