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
31
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] Which of the following is NOT true according to the last paragraph?
选项
A、Synthetic fragrances can be used to make a used car smell like a new one.
B、Synthetic flavors and fragrances have added to the varieties of products.
C、Lemon soap is made out of some delicious lemon.
D、It is likely that a bottle of orange juice is synthesized.
答案
C
解析
细节题型。可用排除法:选项A、D的内容见第四段后半句,选项B的内容见第四段前半句;只有选项C的内容未被提及(因为lemon柠檬属于naturalsubstance,不是人工合成物),所以是答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3323246.html
相关试题推荐
Thelimitedgaincouldhardlyserveasarelievingjustificationforthetremend
Naturalflavoringsandfragrancesareoftencostlyandlimitedinsupply.Fo
Naturalflavoringsandfragrancesareoftencostlyandlimitedinsupply.Fo
Naturalflavoringsandfragrancesareoftencostlyandlimitedinsupply.Fo
Naturalflavoringsandfragrancesareoftencostlyandlimitedinsupply.Fo
Thefirstrecordeduseofnaturalgastolightstreetlampsitwasinthetowno
Naturalflavoringsandfragrancesareoftencostlyandlimitedinsupply.Fo
Naturalflavoringsandfragrancesareoftencostlyandlimitedinsupply.Fo
Naturalflavoringsandfragrancesareoftencostlyandlimitedinsupply.Fo
Naturalflavoringsandfragrancesareoftencostlyandlimitedinsupply.Fo
随机试题
A.ifB.sourcesC.createdD.pureE.stemF.factorsG.theoriesH.sp
[originaltext]M:Hi,Susan.How’sitgoing?HowwasyourfirstweekintheAIDS
[audioFiles]audio_eham_j71_001(20082)[/audioFiles]A、10.B、8.C、6.D、Noneofthe
PlanningaWritingLessonI.Whatisagenre—variousinkind—commonfeatures
Doyouwanttoliveforever?Bytheyear2050,youmightactuallygetyourw
教育法律关系与一般法律关系的重要区别在于教育法律关系具有()。A.复杂性 B
(2016年)下列房屋附属设备和配套设施,无论在会计核算中是否单独记账与核算,都
下列各项,可以提高房地产市场整体运行效率的有()。A.宣传法律法规 B.专
下列关于开放式基金份额变动分析的说法,错误的是()。 A.一般来说,如果基
A.侵犯商业秘密行为 B.混淆行为 C.虚假宣传行为 D.诋毁商誉行为药品
最新回复
(
0
)