题目内容
阅读下列短文, 从所给的四个选项中, 选出最佳答案。
Teeth can get knocked out in a fall, a fight or an accident, but with quick action the tooth could be saved. Pick the tooth up and, if it is dirty, rinse (冲洗) it in clean, lightly-salted water or clean milk and put it straight back in its place. Do not use disinfectant (消毒剂)! Then—and only then—start looking for a dentist or a dental hospital. The tooth has a very good chance of surviving (生存). A delay, even as little as 30 minutes, reduces the tooth's ability to heal (愈合) back to the gum (牙床).
A dental expert writing in the "British Dental Journal" says that a knocked-out tooth has 99 percent chance of survival if reinserted (put back in place) quickly. Putting the tooth back can still be useful even if the tooth itself dies. It helps the damaged(损坏的) flesh to heal and stops neighboring teeth moving to fill in the gap (缺口). This makes it easier for the dentist to repair the damage.
1. The article is mainly on ___________.
[ ]
A. how to save a knocked-out tooth
B. how to look for a?good dentist
C. the theory that a tooth has a very good chance of surviving
D. the fact that a delay reduces the tooth's ability to heal back to the gum
2. The following sentences tell what to do if a tooth is knocked out. Which is the right procedure (步骤)?
[ ]
1) Pick the tooth up.
2) Put the tooth straight back in its place.
3) Look for a dentist or dental hospital.
4) Rinse the tooth in clean, lightly-salted water or clean milk.
A. 4-2-3-1
B. 1-2-3-4
C. 1-4-3-2
D. 1-4-2-3
3. When the writer says "A delay, even as little as 30 minutes, educes the tooth's ability to heal back to the gum." he really wants to express that ________.
[ ]
A. a knocked-out tooth should be put back after 30 minutes
B. it took us 30 minutes to put a knocked-out tooth back
C. a knocked-out tooth must be found in 30 minutes
D. a knocked-out tooth must be put back as soon as possible
4. From this passage we know that it is easier for the dentist to repair the damage if the gap _____.
[ ]
A. is too large
B. is too small
C. remains the same
D. is not large enough
5. In saving a knocked-out tooth, one of the followings is warned not to use. It is __________.
[ ]
A. milk
B. clean, lightly-salted water
C.disinfectant
D.any medicine
