2. 医学
  3. A、Causes of tooth decay. B、Methods of preventing gum disease. C、A new way to remove tooth decay. D、The breakdown of nerve tissue

A、Causes of tooth decay. B、Methods of preventing gum disease. C、A new way to remove tooth decay. D、The breakdown of nerve tissue

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问题  
M: Maria, you are leaving early today.
W: Yes, I have a dentist’ s appointment. I put it off as long as I could. But I know I’ve got at least one cavity.
M: I understand how you feel. I always felt the same until the last time I went to the dentist.
W: What changed your mind then?
M: My dentist is using a new method to clean out cavities, and it’ s painless.
W: Painless? You mean after you have a shot of no-vocaine to deaden the nerve?
M: No, I mean completely painless. The new method uses a pump that delivers a salty-acid solution to the cavity in a pulsating stream.
Q4: What is the main topic of the talk?
Q5: What caused the discussion?
Q6: Which of the following is true according to the conversation?
选项 A、Causes of tooth decay.
B、Methods of preventing gum disease.
C、A new way to remove tooth decay.
D、The breakdown of nerve tissues.
答案C
解析 由男士所说的“My dentist is using a new method to clean out cavities”可知，主要谈论的是清除牙洞的新方法。故选C。
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