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．
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
2.The best way to keep a knocked-out tooth healthy outside the mouth is to store it .
A．in cell-culture medium B．in milk C．in water D．in the open air
3.Milk can be used instead of cell-culture medium to put a knocked-out tooth in because ．
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
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 .
A．cheapest and healthiest B．least painful and cheapest
C．quickest and least painful D．easiest and healthiest
The best way of learning a language is using it. The best way of learning English is talking in English as much as possible. Sometimes you’ll get your words mixed up(混合)and people will not understand you. Sometimes people will say things too quickly and you can’t understand them. But if you keep your sense of humor(幽默感),you can always have a good laugh at the mistakes you make. Don’t be unhappy if people seem to be laughing at your mistakes. It’s better for people to laugh at your mistakes than to be angry with you, because they don’t understand what you are saying.The most important thing for learning English is:“Don’t be afraid of making mistakes because everyone makes mistakes.”
1.What should you do in learning English?
A. Be careful not to make any mistake. B. Write as quickly as you can.
C. Speak English as much as you can. D. Laugh all the way.
2.When people laugh at your mistakes, you should______.
A. not care B. be happy C. feel worried D. be unhappy
3.When you make a mistake, you should______.
A. keep quiet B. get angry C. be kind D. keep your sense of humor
4. The story tells us: “________”
A. Only foolish people make mistakes B. Few people make mistakes
C. People never make mistakes D. There is no one who doesn’t make mistakes
One day a very wealthy father took his son on a trip to the country with the firm purpose of showing his son how poor people can be.
They spent a couple of days and nights on the farm of 36 would be considered a very poor family. On their 37 from their trip, the father asked his son, “ How was the trip?”
“It was 38 , Dad .”
“Did you see how poor people can be?” the father asked.
“Oh yeah?” said the son.
“So what did you 39 from the trip?” asked the father.
The son answered, “I saw that we have one dog and they have four. We have a pool that 40 to the middle of our garden and they have a creek (小溪) that has 41 end. We have lanterns（路灯）in our garden and they have the 42 at night. We have a 43 piece of land to live on and they have fields that go 44 our sight. We have servants who serve us, but they always serve 45 . We buy our food, but they grow theirs. We have 46 around our property（财产）to protect us but they have friends to protect them.”
With this the boy’s father was 47 .
Then his son 48 , “Dad, thank you for showing me how 49 we are.”
Too many times we 50 what we have and only pay attention to what we don’t have. What is one person’s 51 object is another’s most valuable thing. It’s all 52 on one’s perspective (视角).Think about what would happen if we all gave 53 for what we have, 54 worrying about what we don’t have.
Be thankful for every single thing in your life, exactly as it is now–and 55 your friends. So do be sure to take the time to express your appreciation and gratitude for the people whom you are close to!
1.A. which B. that C. what D. how
2.A. arrival B. return C. coming D. reach
3.A. shameful B. disappointing C. surprising D. great
4.A. suffer B. regret C. hear D. learn
5.A. reaches B. gets C. arrives D. flows
6.A. much B. some C. no D. another
7.A. stars B. lights C. darkness D. torches
8.A. smooth B. full C. large D. small
9.A. through B. within C. beyond D. across
10.A. themselves B. visitors C. friends D. us
11.A. dogs B. walls C. soldiers D. policemen
12.A. discouraged B. satisfied C. delighted D. speechless
13.A. explained B. announced C. informed D. added
14.A. poor B. wealthy C. lucky D. proud
15.A. think of B. forget C. remember D. consider
16.A. valuable B. useful C. priceless D. useless
17.A. based B. relied C. decided D. laid
18.A. love B. concern C. thanks D. interests
19.A. more than B. along with C. instead of D. except for
20.A. especially B. besides C. specially D. only
һDid the book give the information you needed?
һYes. But it, I had to read the entire book.
A. finding B. found C. to find D. having found
It is said that a certain careless operation ____ the terrible fire in Shanghai in Nov.15.
A. resulted from B. resulted in C. turned out D. worked out
Was it in the hotel _____ my father works _____ you met the film star the other day?
A. that; that B. where; where C. where; that D. that; where
