today there are all kinds of toothpastes.Toothpastes come in different colors and flavors.When you choose your toothpaste,make sure it has fluoride.Fluoride makes your teeth strong.Sometimes your teeth need deeper cleaning than brushing.That is when floss is helpful.You pull it between your ...
(2)E.根据后句"Notlongafterthat,someoneinventedthetoothpastetube.Thatwaypeoplecouldputthepasterightontothetoothbrush.不久之后,有人发明了牙膏管。这样人们就可以把牙膏直接涂在牙刷上。"可知说的是牙膏的发明,结合选项,应说大约100年前,一些人终于发明了一种牙膏来清洁牙齿。故选E。(3)A.根据后句"Theycome...
__ __ Did you know that the toothbrush was invented by the Chinese in 1,000 AD? We now have lots ofchoices in toothbrushes, with different sizes, shapes, colors and so on. Your dentist will tell you which toothbrush is the right size and shape for you. __ __ ② What is in ...
19 Later they learned that cleaning their teeth was important. But they didn't have toothpaste then. They tried things such as chalk and lemon juice.20 Not long after that, someone invented the toothpaste tube. That way people could put the paste right onto the toothbrush.Tooth brushing ...
C.Fluoride makes your teeth strong and healthy.D.Today they are made of soft plastic (塑料)and are much easier to use!E.To stop toothache,they had their teeth pulled out.答案细节推理题。(1)根据上文Long ago,as people got older,there was something wrong with their tee...
When you choose your toothpaste, make sure it has fluoride (氟化物), which makes your teeth strong .Use dental floss (牙线)Sometimes your teeth need deeper cleaning (更深的清 ) than brushing.That is when floss is helpful. You pull it between your teeth, and it reaches(到达) places ...
A.Fluoride B.Bristles C.Enamel D.Sugar 34.Why are sugary foods eaten before going to bed very damaging? A.Because bacteria is active at night. B.Because the enamel is weak at that moment. C.Because you have too much before going to bed. ...
56.Later they learmed that cleaning their teeth was important. But they didn't have toothpaste then. They tried things such as chalk and lemon juice.57.Not long after that, someone invented the toothpaste tube(牙膏管). That way people could put the paste right onto the toothbrush.Tooth ...
a氯化铁溶于乙醇,然而氟化铁不溶于乙醇 The ferric chloride dissolves in the ethyl alcohol, however the ferric fluoride does not dissolve in the ethyl alcohol[translate] a零上20多度吗 In zero more than 20 degrees[translate] ai wilk love you i wil爱您[translate] ...
They learned to brush teeth twice a day.Today there are all kinds of toothpaste.Toothpaste comes in different colors and flavors.When you choose your toothpaste, make sure it has fluoride. Fluoride makes your teeth strong.Use floss Sometimes your teeth need deeper cleaning than brushing. That ...