题目内容
What do you do if you are hit in the mouth and one of your teeth is knocked out? A dentist(牙医)may be able to put the tooth back in for you, but you have to get to the dentist first．In the meantime, you have to store the tooth so that it will stay healthy．
The simplest thing to do is put the tooth back into your mouth, or you could put it in milk．Frank Courts, a dentist at the University of Florida, worked with other researchers to find the safest way of keeping knocked-out teeth．He tried putting teeth into milk, into water, and into cell-culture medium(细胞培养液)．He also tried, just drying the teeth in the open air．He used teeth that had to be removed from people’s mouths for various reasons．The teeth were put into one of the solutions(溶液)or stored in the air for one hour．Then cells from the root of the teeth were scraped-off the teeth．Dr．Courts and the others then studied how healthy these cells were．
The cell-culture medium worked best to keep a knocked-out tooth healthy outside the mouth．However, few people keep cell-culture medium handy at home or in school．
The next best thing was milk．But Dr．Courts said that the best thing of all was to wash the tooth and put it right back into its socket(牙槽)in the mouth．For some people, though, this is just too painful or upsetting．So milk will do, until you get your tooth (and your mouth)to a dentist．
小题1:This passage is mainly about ．
小题2:The best way to keep a knocked-out tooth healthy outside the mouth is to store it .
小题3:Milk can be used instead of cell-culture medium to put a knocked-out tooth in because ．
小题4:“Dr．Courts said that the best of al1 was to wash the tooth and put it right back into its socket in the mouth．”In the sentence, the word “best” means .
The simplest thing to do is put the tooth back into your mouth, or you could put it in milk．Frank Courts, a dentist at the University of Florida, worked with other researchers to find the safest way of keeping knocked-out teeth．He tried putting teeth into milk, into water, and into cell-culture medium(细胞培养液)．He also tried, just drying the teeth in the open air．He used teeth that had to be removed from people’s mouths for various reasons．The teeth were put into one of the solutions(溶液)or stored in the air for one hour．Then cells from the root of the teeth were scraped-off the teeth．Dr．Courts and the others then studied how healthy these cells were．
The cell-culture medium worked best to keep a knocked-out tooth healthy outside the mouth．However, few people keep cell-culture medium handy at home or in school．
The next best thing was milk．But Dr．Courts said that the best thing of all was to wash the tooth and put it right back into its socket(牙槽)in the mouth．For some people, though, this is just too painful or upsetting．So milk will do, until you get your tooth (and your mouth)to a dentist．
小题1:This passage is mainly about ．
| A．how a dentist can save a knocked-out tooth |
| B．how to keep a knocked-out tooth healthy |
| C．how Dr．Courts and other researchers made their experiments |
| D．how to put a knocked-out tooth back into its socket |
| A．in cell-culture medium | B．in milk | C．in water | D．in the open air |
| A．milk works better to keep the tooth healthy | B．milk causes less pain |
| C．cell-culture medium is not usually handy | D．cell-culture medium is more expensive |
| A．cheapest and healthiest | B．least painful and cheapest |
| C．quickest and least painful | D．easiest and healthiest |
小题1:B
小题1:A
小题1:C
小题1:D
略
练习册系列答案
相关题目
nstead of 37 , he sat next to my side and placed the flower to his nose and 38 loudly with certainty, "It sure smells pretty and it must be beautiful, too. That's why I picked it; here, it's for you." The weed before me was dying or dead, not vibrant of 39 , orange, yellow or red. But I knew I must take it, or he might never leave. So I 40 for the flower, and replied, "Just what I need." Again, 41 placing the flower in my hand, he held it mid-air without reason or plan. It was then 42 I noticed for the very first time that the boy could not see: he was 43 . 
making
y don’t reach them, they use QQ, e-mails, and text messaging to get the words out.
hen planning to get together with friends”, Julian said, “the easiest and fastest way I know is to send a text message to my contact group.”Jocelyn said. “If I want to go to see a movie with a few friends, I usually send text message to them. By telephone, you have to call every single friend one by one. But text messaging allows you to send the same message to as many as you’d like, which saves a lot of time. ”
rt “get the words out” means“ ”.