阅读下列材料,从每题所给的 A、B、C、D 四个选项中选出最佳选项。
(A)
Teeth health—6 messages for children to learn & share
1. The first baby teeth fall out between ages 6 and 12. The second teeth are the last set.
2. We have two different kinds of teeth. Front teeth for biting (咬) and back teeth for chewing (咀嚼).
3. When we don't brush our teeth well, our teeth may have plague. It may have bad tooth problems.

4. Eating and drinking sweet things can make your teeth bad.
5. Give your children water or milk in a cup. Sugar in drinks like fruit juice can hurt your teeth.
6. Brush teeth well twice a day with toothpaste. It can keep your teeth strong and healthy. Using toothpaste with fluoride (氟) can make your teeth strong.
()1. At what age do people usually lose their baby teeth?
A. Between ages 0 and 3.
B. Between ages 3 and 6.
C. Between ages 6 and 12.
D. Between ages 12 and 15.
()2. What does the underline word "plague" mean?
A. A bad thing from the juice.
B. Something bad in the toothpaste.
C. A dirty thing on the toothbrush.
D. Something bad for one's teeth.
()3. Which of the following can help protect your teeth?
A. Drinking more fruit juice.
B. Using toothpaste with fluoride.
C. Eating more sweet things.
D. Chewing with front and back teeth.

1.C 2.D 3.B

【分析】
这是一篇关于儿童牙齿健康的阅读理解题，需根据题干问题定位原文对应信息，结合语境分析词义，逐一排除错误选项得出答案。第1题需定位换牙年龄的原文内容；第2题需结合上下文语境猜测划线词含义；第3题需找出原文中保护牙齿的正确做法，对比选项选出答案。
【解析】
1. 细节理解题：根据原文第1条“The first baby teeth fall out between ages 6 and 12.”可知，儿童通常在6到12岁之间脱落乳牙，对应选项C，故选C。
2. 词义猜测题：原文第3条提到“当我们不好好刷牙时，牙齿可能会有plague，可能会有严重的牙齿问题”，由此可知plague是对牙齿有害的东西，对应选项D，故选D。
3. 细节理解题：A选项“多喝果汁”，原文第5条指出果汁中的糖会伤害牙齿，错误；B选项“使用含氟牙膏”，原文第6条明确说明含氟牙膏能让牙齿坚固，正确；C选项“多吃甜食”，原文第4条提到甜食会损害牙齿，错误；D选项“用前后牙咀嚼”，原文第2条说明前后牙的功能，但这不是保护牙齿的方法，错误，故选B。
【答案】1.C 2.D 3.B
【知识点】英语阅读理解、细节理解、词义猜测
【点评】本文围绕儿童牙齿健康给出6条实用建议，题目设置贴合原文内容，侧重考查信息定位与词义猜测能力，难度适中，适合学生巩固阅读基础。
【难度系数】0.8