2. 外语
  3. A、Food particles. B、Gum disease. C、Unhealthy living habits. D、Chemical erosion. B短文末尾部分指出，除了牙齿受损外，还会出现牙龈疾病，细菌先是侵害牙龈，接下来会使骨头受损收缩，

A、Food particles. B、Gum disease. C、Unhealthy living habits. D、Chemical erosion. B短文末尾部分指出，除了牙齿受损外，还会出现牙龈疾病，细菌先是侵害牙龈，接下来会使骨头受损收缩，

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问题  
Take care of your teeth and your teeth will take care of you. Your teeth are a living part of your body. They have nerves and blood vessels. Diseased teeth can cause pain, die and fall out. Plaque is the main enemy of healthy teeth. Everyone has plaqu
选项 A、Food particles.
B、Gum disease.
C、Unhealthy living habits.
D、Chemical erosion.
答案B
解析 短文末尾部分指出，除了牙齿受损外，还会出现牙龈疾病，细菌先是侵害牙龈，接下来会使骨头受损收缩，从而导致牙齿脱落由此可知，牙龈疾病是成人牙齿掉落的主要原因，故答案为B。
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大学英语四级

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