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Passage Three
篇章三
Take care of your teeth and your teeth will take care of you.
好好保護你的牙齒，牙齒不會虧待你的。
Your teeth are a living part of your body. They have nerves and blood vessels.
牙齒是身體的有機部分。他們也有神經和血管。
Diseased teeth can cause pain, die and fall out.
齲齒會疼痛、死亡，然后脫落。
Plaque is the main enemy of healthy teeth. Everyone has plaque.
牙斑是一口好牙的勁敵。每個人都有牙斑。
It is a sticky colorless film that coats the teeth.
它是一種無色的黏著薄膜，覆蓋在牙齒上。
Plaque is always forming on the teeth, especially at the gum line.
牙斑總是在牙齒表面形成，牙齦線上尤其常見。
If plaque is not removed, it builds up and gets under the gum line.
如果不把牙斑清掉，它就會一點點累積起來，侵蝕牙齦線。
Plaque that is left on the teeth for some time hardens; the result is tooth decay and gum disease.
被留在牙齒表面的牙斑，一段時間以后變硬，最終導致蛀牙和牙周炎。
The bacteria in plaque live on sugar.
牙斑中的細菌靠糖類生存。
They change sugar into acids, which break down the tooth's harder outer covering.
他們把糖轉化成酸，酸會分解堅硬的牙齒外殼。
If left untreated, decay goes deeper and deeper into the tooth.
如果對之放任不管，牙齒會從外到里一點點壞掉。
After a while, the decay reaches the nerves and blood vessels of the inner tooth.
一段時間以后，牙齒內部的神經和血管也被腐蝕。
By the time this happens, the tooth has probably started to ache.
到了這個時候，就會牙疼了。
In addition to tooth decay, there are also gum diseases to watch out for.
除了蛀牙以外，還得小心牙周炎。
The bacteria in plaque make poisons that attack the gums.
牙斑中的細菌會產生損傷牙齦的毒素。
Small pockets form around the teeth.
牙齒四周會形成小的帶狀物。
The pockets trap more bacteria and food particles.
這些帶狀物儲存越來越多的細菌和食品的殘留物。
Finally, the bone supporting the teeth is attacked and starts to shrink.
最后，支撐牙齒的骨質被侵蝕，逐漸萎縮。
Teeth become loose and may fall out. Adults lose most teeth this way.
牙齒松動，還有可能脫落。成人的牙齒大多都是這么變沒的。
Keep your mouth healthy. When you brush your teeth, do a good job.
保持口腔健康。刷牙時，仔細點兒！
Questions 22 to 25 are based on the passage you have just heard.
根據你剛才聽到的篇章，回答22至25題。
Question 22. What does the speaker say about our teeth?
問題22. 關于牙齒，說話者提到了什么？
Question 23. What does the speaker say about plaque?
問題23. 關于牙斑，說話者說了些什么？
Question 24. Why is sugar harmful to teeth?
問題24. 為什么糖會損害牙齒？
Question 25. What causes adults to lose most of their teeth according to the speaker?
問題25. 根據談話者所說，是什么導致成人的大部分牙齒變沒的？
