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
The development of toothpaste began as long ago as 3000/5000 BC in the ancient countries of China and India. According to Chines
The development of toothpaste began as long ago as 3000/5000 BC in the ancient countries of China and India. According to Chines
admin
2010-07-19
29
问题
The development of toothpaste began as long ago as 3000/5000 BC in the ancient countries of China and India. According to Chinese history, Huang-Ti claimed different types of pain felt in the mouth could be cured by sticking gold and silver needles into different parts of the jaw and gum. h was theories such as these that led to the development of dental cream. During the years 3000/5000 BC, Egyptians made toothpaste using a recipe of powdered ashes of hooves of oxen, myrrh, powdered and burned eggshells and pumice. It is assumed that the ancient Egyptians used their fingers to rub the mixture onto teeth.
The tooth stick, the forerunner of the toothbrush, had not, as far as is known, been discovered at this time. From the records of the ancient countries of India, China and Egypt, it was the Greeks and Romans who developed and improved toothpaste and developed a leaden instrument for the extraction of teeth. They were also the first to bind loose teeth together and to support artificial teeth by means of gold wire. During 1000 AD, the Persians gave advice on the dangers of using hard toothpowders and recommendations were made to make toothpowder from burnt hartshorn, the burnt shells of snails and oysters and burned gypsum. Other Persian recipes included dried animal parts, herbs, honey and minerals. One formula for strengthening teeth included green lead, verdigris, incense, honey and powdered flint stone.
Toothpowder or dentifrice was first available in Britain in the late 18th century. It came in a ceramic pot and was available either as a powder or paste. The rich applied it with brushes and the poor with their fingers. The powders were developed by doctors, dentists and chemists and often contained ingredients that were highly abrasive and harmful to the teeth, such as brick dust, china, earthenware or cuttlefish, and to make them more palatable, they contained glycerine. By the early nineteenth century, the ingredient stronchium was introduced, to strengthen teeth and reduce sensitivity, but it only really concentrated on the gums. In the late 18th century, borax powder was used to get the foaming effect. In 1873, an aromatic toothpaste in a jar was introduced in the U.S. and in 1896, Dental Cream was first packaged in collapsible tubes. Before the Second World War, the majority of toothpaste on the market used soap as an emulsifying agent, even though it was known that soap had certain inherent defects.
What is the main subject of the passage?
选项
A、Methods of cleaning teeth.
B、Methods of caring for teeth.
C、Development of toothpaste.
D、Dental history.
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/tvlO777K
0
专业英语八级
相关试题推荐
ThefollowingwerethefoundingfathersoftheAmericanRepublicEXCEPT______.
AmongthefollowingplayswhichisNOTwrittenbyMarlowe?
ThenationalanthemofAustraliaisnowthetuneof_____.butonregalandvice-regaloccasionsGodSavetheQueenmustbeplaye
Ifitwereonlynecessarytodecidewhethertoteachelementarysciencetoeveryoneonamess【M1】_____bas
Wheredidthemoviesbegin?ItisoftensaidthattheyareanAmericaninvention,andthisisnotentirelytree.Themotionpict
Wheredidthemoviesbegin?ItisoftensaidthattheyareanAmericaninvention,andthisisnotentirelytree.Themotionpict
1 ThiscalmingdownisperhapsthemainreasonwhyIkeepadiary.Itisincrediblehowthewrittensentencecancalmandtame
Inordertogetyourpointacrossinyourtargetlanguage,youhavetolearnplentyofwords.Howdoyousetaboutit?Dr.Paul
Inordertogetyourpointacrossinyourtargetlanguage,youhavetolearnplentyofwords.Howdoyousetaboutit?Dr.Paul
A、doesn’treallythinkaboutitB、dislikeitverymuchC、worriesaboutitgreatlyD、wantsareformB
随机试题
A.有利、自主、公正、互助B.有利、自主、公平、帮助C.舆论、习俗、信念D.舆论、方法、信念、习俗E.以上都是医德评价的主要标准
人民法院受理了绿野公司债权人提出的对绿野公司破产清算的申请,下列问题应给予否定回答的有:()
背景某新建办公楼工程,主楼建筑面积29600m2,地上16层,地下1层,基础埋深4m,现浇混凝土框架一剪力墙结构。附楼建筑面积5000m2混合结构,地上3层。地下防水采用防水混凝土附卷材防水,屋面采用卷材防水,室内采用涂料防水。土方开挖采用放坡形式。预制
我国参照过去伦敦协会条款制定的海洋运输条款,仍采用()险别
企业上年年末的资产负债表(简表)如下(单位:万元):根据历史资料可知,经营资产、经营负债项目与营业收入成正比,金融资产为可动用的金融资产,企业上年度营业收入800万元,实现净利100万元,支付股利60万元。要求:如果预计本年度不含通货膨胀的营业收
请认真阅读下列材料,并按要求作答。根据上述材料完成下列任务:什么是数据分析观念?如何培养学生的数据分析观念?(10分)
下列叙述正确的是()。
送蔡元振序曾巩古之州从事①,皆自辟士,士择所从,故宾主相得也。如不得其志,去之可也。今之州从事,皆命于朝,非惟守不得择士,士亦不得择所从,宾主岂尽相得哉!如不得其志,耒可以
以下哪项,如果为真,能支持题干中专家的结论?
TheCounsellingServicemaycontacttutorsif
最新回复
(
0
)