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
Natural flavorings and fragrances are often costly and limited in supply. For example, the vital ingredient in a rose fragrance
Natural flavorings and fragrances are often costly and limited in supply. For example, the vital ingredient in a rose fragrance
admin
2011-01-13
35
问题
Natural flavorings and fragrances are often costly and limited in supply. For example, the vital ingredient in a rose fragrance is extracted from natural rose oil at a cost of thousands of dollars a pound; an identical synthetic substance can be made for 1% of this cost. Since the early twentieth century, success in reproducing these substances has created a new industry that today produces hundreds of artificial flavors and fragrances.
Some natural fragrances are easily synthesized; these include vanillin, the aromatic ingredient in vanilla, and benzaldehyde, the aromatic ingredient in wild cherries. Other fragrances, however, have dozens, even hundreds of components. Only recently has it been possible to separate and identify these ingredients by the use of gas chromatography and spectroscopy. Once the chemical identity is known, it is often possible to synthesize them. Nevertheless, some complex substances, such as the aroma of fresh coffee, have still not been duplicated satisfactorily.
Many of the chemical compounds making up these synthetics are identical to those found in nature, and are as harmless or harmful as the natural substances. New products must be tested for safety, and when used in food, must be approved by the U.S. Food and Drug Administration.
The availability of synthetic flavors and fragrances has made possible a large variety of products, from inexpensive beverages to perfumed soap to used cars with applied "new car odor."
The underlined word "duplicated" in Paragraph 2 is closest in meaning to ______.
选项
A、make double
B、make a copy of
C、produce something equal to
D、take from
答案
C
解析
推断题型。从第二段前几句得知:Some natural fragrances are easily synthesized.(有些天然香料可以很容易地进行人工合成。)Other fragrances,however,have dozens, even hundreds of components.(而有些却包含有几十甚至上百种成分——言外之意,较难合成。)Only recently has it been possible to separate and identify these ingredients by the use of gas chromatography and spectroscopy.(只是到了最近,由于使用气相色谱分析和分光镜才能分离或鉴别出这些成分。)Once the chemical identity is known,it is often possible to synthesize them.(一旦了解了它们的化学成分,人们就有可能将之合成。)Nevertheless, some complex substances, such as the aroma of fresh coffee.have still not been duplicated satisfactorily.(然而仍有一些复杂的成分,如新鲜咖啡的香味难以合成得令人满意。):由此可推断出很难合成与新鲜咖啡香味相同的香料。选项C内容与此意最接近,所以是答案。
转载请注明原文地址:https://kaotiyun.com/show/Ut5O777K
本试题收录于:
CATTI三级笔译综合能力题库翻译专业资格(CATTI)分类
0
CATTI三级笔译综合能力
翻译专业资格(CATTI)
相关试题推荐
TheBessemerprocessfor(converting)irontosteel(wasinvention)ofenormousimportance(because)itledtomany(significant
A、Thebookhadbeenmisplacedontheshelf.B、Hecanprobablygetacopyofthebookforthewoman.C、Hewillcallthewarehouse
PerhapsoneofthemostdramaticandimportantchangesthattookplaceintheMesozoiceraoccurredlateinthatera,among
A、Judgingpeople’sbehavior.B、Commoncausesofanger.C、Changingpeople’sattitudes.D、Theeffectsofnegativebehavior.AWhat?
TheSt.LouisPost-Dispatch(was)foundedin1878(andby)1881(hadbecome)the(mostlargest)eveningnewspaperinthecity.
Tunas(migratelong)distancesoveralltheworld’s(oceans)andoccupy(tropical),temperate,andeven(some)thecoolerwaters
Anyonewithabsolute,orperfect,pitch(are)abletoidentifybyear(any)noteat(some)standardpitchorto(sing)aspecifie
[Problem]Themanishavingdifficultyfindingaparkingspace.Hewantstogotohisprofessor’spresentationrightaway,bu
FilmExchangesinAmerica’sEarlyMovieIndustry1.Motionpictureswereexhibitedtothepublicinthelate1800s,thoughthe
GlobalDevelopmentsSociologiststellusthereisalinkbetweenprivatelivesandsocialforces.Anoutstandingexampleof
随机试题
下列科目中期末余额应转入本年利润的有()
急性肾衰竭少尿期一般为
A.血液检查B.尿液检查C.粪便检查D.皮屑检查E.体表淋巴结穿刺检查夏季,某马群体温升高,呈间隙热,眼结膜、瞬膜上有黄豆大的出血斑,尿量减少,尿色深黄、黏稠。后期腋下、胸前水肿。检查马体,未发现硬蜱。进一步诊断该病,首选的检查方法是
A.茵陈B.萆薢C.虎杖D.地肤子E.金钱草具有利湿退黄,散瘀止痛功效的药物是
依法治国方略的实施是一项浩瀚庞大、复杂而艰巨的系统工程,要全面发挥各种社会规范的调整作用,综合协调地运用多元化的手段和方法实现对国家的治理和管理。关于依法治国理念的基本要求,下列哪一说法是不准确的?()
架空隔热制品距山墙或女儿墙不得小于()mm。
万利家具公司为中档卧室家具生产企业,成立于1995年,并于2000年在深圳证券交易所公开发行股票及上市。万利家具公司2005年至2010年间分店数量、职工人数、收入总额及税前利润数据如下:鉴于2011年第一季度税前利润继续下滑,万利家具
2017年12月,我国北京汽车集团与某国签署了汽车生产合作协议。双方将合资在该国沿海M地设立汽车生产基地,该项目工厂投产后,带动的直接和间接就业人口有1万余人,其50%以上的产品将供出口,年出口金额约为10亿美元。下图示意该国及M地的位置,据此完成下列问题
选择合适的相关系数必须考虑()
社会主义和谐社会的核心、本质和主题是()
最新回复
(
0
)