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
2015-10-13
34
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. "
Which of the following is the best title for the passage?
选项
A、How to Synthesize Fragrances
B、Synthetic Substances Are Easy to Make
C、Natural Flavorings and Fragrances
D、Synthetic Flavors and Fragrances
答案
D
解析
主旨题型。阅读全文可知本文是围绕天然调味品和香料供应有限且价格不菲(见第一段第一句),后有了人工合成品替代(尽管有些合成容易,有些困难),使大量生产成为可能;其中主要部分谈的是人工合成品(调味品和香料);因此选项D为答案。
转载请注明原文地址:https://kaotiyun.com/show/ixwO777K
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
AirPollutionandAcidRainTheincreasingvarietyandprevalenceofpollutionpresentstheworldwithmanyextremelydaunti
"Professor’sOffice"Whatexperiencedoesthemanhavethatmaybehelpful?
"Professor’sOffice"Whatdoestheprofessormeanwhenshesaysthis:
A、Hedoesn’twantthewomantofilloutthesurveyform.B、Hejustgottheresultsofthesurvey.C、Hewantstomakethedorma
MountRushmoreMountRushmoreisamonumenttotheidealsoftheUnitedStates.Thefacesoffourpresidentswhocontributed
A、Shehasplanstoworkinasupermarketthissummer.B、Shewantstotakeaclassinmarketing.C、Shedoesn’twanttoworkthis
Scientistshaveknownforsometimethatcertainplants,calledhyperaccumu-lators,canconcentratemineralsatlevelsahundred
Youwillnowbeaskedtogiveyouropinionaboutafamiliartopic.Afteryouhearthequestion,youwillhave15secondstoprep
TheU.S.model,widelycriticizedonitscombinationofprivateinsuranceandpublicly-fundedprograms,spendsmoreonhealthca
随机试题
Thekillerarrestedbythepolicehasalreadyclaimedfourlives,andeventhedetectivesare_____.
onmutuallydevelopitlongandacrosswhoevenefficientcomparative
资本主义地租是
下列检查中,对诊断慢性肺心病最有价值的是
血浆半衰期
证券公司设立限定性集合资产管理计划的,净资本不得低于人民币3亿元。()
在反映企业偿债能力的财务指标中,流动比率维持在()较为理想。
在下列我国著名的古城池中,城内街道、市楼、商店等均保留原有形制,是研究明代县城建制实物资料的为()。
学习筑巢在鸟类成功繁殖的过程中扮演着重要角色。斯诺博士近几年中所记录下的画眉鸟的生育过程表明。第一次筑巢的鸟成功的概率大大小于其他较老的同类,也小于自己以后筑巢的成功概率。同大多数其他鸟类一样,画眉鸟完全长成后才离开母巢。所以,我们很难回避这样的结论:它们
A、奇怪B、生气C、愉快D、失望A第二段的第一句“在男孩要纸的过程中,老师起了疑心,”其中,“起了疑心”的意思是产生了怀疑,所以选择A。
最新回复
(
0
)