Chinese people are believed to have made 【小题4】next big step in the history of the toothbrush, creating the ancestor of today’s toothbrush. These first toothbrushes had a handle made of bamboo and a set of the Siberian wild pig’s hair 【小题5】 (attach) to the handle. ...
Others say the Romans invented it around the time of Caesar. Nobody knows the exact history of teeth cleaning.Before the first toothbrushes,sharp(尖的) objects were used to clean teeth.It's believed that tribes in Afric a and Australi a invented the ide a of cleaning their teeth. The ...
Yes, it’s the toothbrush. But do you know anything about its history? 1 it 2 what it either be because what else by invent clean popular habit hundred According to some research, before toothbrushes appeared, the ancient Chine...
Learn about the history of dental floss, how it has evolved, and its benefits to your oral health. Find out more about dental floss history at Oralb.com
50题答案:C 考查主旨题,根据文中的第一段Teeth are important parts of our body.If we want to keep our teeth healthy and clean,we should brush teeth at least twice a day.How can we brush our teeth?Of course by using toothpaste and toothbrushes.But do you know the history of toothpaste?
The interesting history of the toothbrush 相关知识点: 试题来源: 解析 答案见上语篇解读 牙刷是一种常见的物品,大多数人每天都在使 用。 这个看似简单的工具其实有着悠久而有趣的 历史,本文对此进行了介绍。 答案详析 11. A 细节理解题。 根据第二段前两句“The first toothbrushes were actually small ...
But do you know1 about its history?Before toothbrushes appeared, the 2Chinese people cleaned their teeth with some smal tree branches(树枝). About 800 years ago, people3 a kind of toothbrushes with pig hair and bamboo. It might be the world's earliest form of toothbrushes. As time went ...
Have you ever wondered why we have 115VAC or 230VAC mains voltages, or 50Hz or 60Hz? Who chose these numbers, anyway? This chapter explains the history of the development of AC power. Is there room for linear AC/DC power supplies in the modern world, or are switching power supplies the...
it is?Yes,it's the toothbrush.But do you know anything about its history? According to some research,before toothbrushes appeared,the ancient Chinese people (3) their teeth with some small tree branches (树枝).About 800 years ago,people made a kind of brushes with pig ...
Today, toothbrushes come in all shapes and sizes and are made from all kinds of materials. You can even buy electric toothbrushes that do all the work for you! Who would have thought that such a simple tool could have such an interesting history? The next time you reach for your toothbrus...