女孩，3岁。幼儿园检查牙齿有洞。患儿有时塞牙。检查：右下第一乳磨牙远中
面龋洞 较深，邻间隙内有食物残渣，叩痛(-)，不松动，牙龈未见异常。X线显示右下第一乳磨牙有一龋损接近牙髓，牙根未见异常。
如果去尽腐质达牙本质深层，但是有一透红点，探针尖轻轻探入，不出血。较好的治疗措施是（）。
A．直接盖髓术
B．氧化锌丁香油粘固粉安抚
C．活髓切断术
D．根管治疗术
E．干髓术
参考答案：C
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| I was always complaining about wind or rain. 1 it was nothing unusual for the arrival of wind or rain, it caused inconvenience for me to go out, and sometimes it even created an awful atmosphere, so I 2 it strongly. On a rainy day a meteorologist (气象学家) I met was very 3 at my great anger caused by rain that made a little inconvenience for me. He asked, "Have you ever seen typhoon? Do you know what would happen to the world if there were no typhoon?" I shook my head. I had no 4 of how overwhelming it was when it 5 everything away in its way. "Well, let me tell you," the meteorologist said. "Without it the 6 of fresh water will be more serious, for it is a great 7 of water supply on earth, Without it, there would be a greater imbalance in the distribution of 8 . The equatorial area that receives the most sunshine on earth 9 entirely on typhoon to disperse(驱散)heat. Without typhoon the tropics would be even 10 while the frigid zones much colder. As a result the temperate zones would 11 from the world..." Ignorance made me 12 . I disliked wind only because it ruffled (吹乱) my hair. I hated rain merely because I had to carry an umbrella. But I had no idea at all that typhoon-something much more violent, something a thousand times more 13 than wind or rain-was a 14 to the existence of mankind. 15 no road on earth goes all the way on level ground, there's no person in the world who can do whatever he pleases. 16 as it is for people to guard against typhoon, it is advisable for a man to stop 17 for a moment before he complains. " 18 disappeared all together? What would the world become then?" The 19 will keep him calm and lead him closer to truth---he will be better 20 of the world he lives in. | |||
| ( )1. A. But ( )2. A. refused ( )3. A. excited ( )4. A. experience ( )5. A. washed ( )6. A. shortage ( )7. A. resource ( )8. A. warmth ( )9. A. holds ( )10. A. warmer ( )11. A. disappear ( )12. A. farsighted ( )13. A. appealing ( )14. A. trouble ( )15. A. Since ( )16. A. Impossible ( )17. A. thinking ( )18. A. How come ( )19. A. theories ( )20. A. careful | B. Therefore B. blamed B. puzzled B. sign B. frightened B. supply B. power B. energy B. keeps B. hotter B. move B. out of sight B. frightening B. danger B. As B. Wrong B. to think B. What about B. answers B. kind | C. Although C. punished C. encouraged C. sense C. swung C. amount C. strength C. water C. moves C. cooler C. escape C. in sight C. disturbing C. must C. When C. Hard C. to rest C. What if C. phenomena C. aware | D. Unless D. fought D. delighted D. recognition D. swept D. waste D. source D. wealth D. depends D. better D. remove D. shortsighted D. exciting D. lead D. While D. Easy D. resting D. Even if D. complaints D. tired |