首页
登录
职称英语
Natural flavorings and fragrances are often costly and limited in supply. Fo
Natural flavorings and fragrances are often costly and limited in supply. Fo
游客
2024-01-01
21
管理
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. " [br] 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,havedozens,even hundreds of components.(而有些却包含有几十甚至上百种成分一一言外之意,较难合成。)Only recently has it been possible to separateand identify these ingredients b
转载请注明原文地址:https://tihaiku.com/zcyy/3323241.html
相关试题推荐
[img]2012q1/ct_etoefm_etoeflistz_0438_20121[/img][br]Whatnaturalfeaturesof
"GeothermalEnergy"→Geothermalenergyisnaturalheat
"GeothermalEnergy"→Geothermalenergyisnaturalheat
"GeothermalEnergy"→Geothermalenergyisnaturalheat
"GeothermalEnergy"→Geothermalenergyisnaturalheat
"GeothermalEnergy"→Geothermalenergyisnaturalheat
"GeothermalEnergy"→Geothermalenergyisnaturalheat
"GeothermalEnergy"→Geothermalenergyisnaturalheat
EnergyfromNaturalGas1.Muchoftheworldgetsitsene
EnergyfromNaturalGas1.Muchoftheworldgetsitsene
随机试题
Weallhaveproblemsandbarriersthatblockourprogressorpreventusfrom
具有直接心肌抑制作用的麻醉性镇痛药是()A.哌替啶 B.阿芬太尼 C.盐
CO和NH在体内跨细胞膜转运属于A.单纯扩散 B.易化扩散 C.出胞或入胞
重新建造设备一台,所需主材50000元,辅材12000元,外购件23000
(2017年真题)证券公司代销金融产品,应当遵循的原则不包括( )。A.平等
下列选项中,诊治关系属于A.技术关系 B.伦理关系 C.文化关系 D.社会
A.4 B.6 C.8 D.9
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
下列关于建筑防火分类的做法中,错误的是()。A.卡拉OK厅各厅室之间采用耐火极
下列通知标题正确的是()。A.X县教育局转发教育部关于加强家庭教育工作的
最新回复
(
0
)