. Which question does Paragraph 2 answer?2. Which question does Paragraph 2 answer?A. Why do people use black seats for bicycles?A. Why do people use black seats for bicycles?B. How hot can a bicycle seat ……

), but I’m not good at keeping them. I’m afraid this bad habit3 will end (结束) our friendships4. How can I correct (改正) it?Debbie, age 11, ShanghaiAWhen our friends tell us their secrets, this means (说明 ……

’t brush our teeth well, our teeth may have plaque. It may cause bad breath and tooth problems.3. When we don’t brush our teeth well, our teeth may have plaque. It may cause bad breath ……

at the age of 12 to 13. Adults (成年人) usually have 28 to 32 teeth. Why pain是蛀牙在捣乱！Why do I have a hole2...September 20 is Love Teeth Day. We use teeth to eat. We need teeth to talk. But do you really know ……

我们的牙齿为什么那么坚固?词数 161 建议阅读时间 5分钟 EVERY day we eat food with our teeth. Sometimes we chew (咀嚼) really hard. But our teeth can last a lifetime without breaking to pieces. Why are teeth so strong?A new ……

not been done on young people. I wouldn't do teeth whitening on anyone under 18."The problem with whitening.... The larger pulp might make teeth moresensitive(敏感的) to whitening and get hurt.Another problem ……

a long-lasting question about our teeth – why do cold food and drinks make our teeth hurt... out on March 26. It answered a long-lasting question about our teeth – why do cold food ……

Our teeth are sensitive to pain. TUCHONGOur teeth are sensitive to pain. TUCHONG为什么我们的牙齿对痛如此敏感？为什么我们的牙齿对痛如此敏感？Our teeth are hard, like strong bones (骨头) inside our mouth. However, they still feel ……

Our teeth are sensitive to pain. TUCHONGOur teeth are sensitive to pain. TUCHONG为什么我们的牙齿对痛如此敏感？为什么我们的牙齿对痛如此敏感？Our teeth are hard, like strong bones (骨头) inside our mouth. However, they still feel ……

(用力咀嚼) foods with your teeth. It’s a wonder that our teeth can last a lifetime without cracking (破裂) to pieces. A new study has found why teeth are so strong. It’s because of the special structure ……

and forks in our mouths. However, they still feel pain quite easily. Why are teeth so sensitive (敏感...为什么我们的牙齿对痛如此敏感？为什么我们的牙齿对痛如此敏感？Our teeth are hard, like built-in knives and forks in our mouths ……

为什么我们的牙齿对痛如此敏感？ 为什么我们的牙齿对痛如此敏感？ Our teeth are hard, like built-in knives and forks in our mouths. However, they still feel pain quite easily. Why are teeth so sensitive (敏感的) to pain?  ……

or even doesn’t form at all.As our food need less power to chew, wisdom teeth are becoming smaller...为什么有的人长智齿，而有的人却不呢？词数 206 建议阅读时间 3分钟ANYONE who has had his or her wisdom teeth removed knows how ……

. *It’s on September 20. How important are teeth to our life? What should we do to keep our teeth healthy? Follow Teens and find out!DO you know the life cycle of teeth in your mouth? Children under 6 have 20 baby ……

) is one. Signs of it are teeth with dark spots (点) or teeth that hurt when eating foods that are very... (蛀牙) is one. Signs of it are teeth with dark spots (点) or teeth that hurt when eating foods ……