问题
单项选择题 A1型题
关于慢性牙周炎哪一项不正确（）。
A.可有牙龈的炎症表现
B.不发生于青少年与儿童
C.有牙槽骨吸收
D.探诊可发现有附着丧失
E.晚期牙齿出现松动
答案
参考答案：B
解析：慢性牙周炎可发生于任何年龄。
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关于慢性牙周炎哪一项不正确（）。
A.可有牙龈的炎症表现
B.不发生于青少年与儿童
C.有牙槽骨吸收
D.探诊可发现有附着丧失
E.晚期牙齿出现松动
参考答案：B
解析：慢性牙周炎可发生于任何年龄。
How to be a healthy kid Hi, boys and girls! Do you know how to be a healthy kid? Here are some rules you should follow. First, eat different foods, especially fruit and vegetables. You may have a favorite food, but you should eat something different. If you eat different foods, you will probably get more nutrients (营养) your body needs. Second，drink water and milk as often as possible .When you are really thirsty, cold water is the first choice. Milk is a great drink that cangive you more calcium your body needs to grow strong bones. Third,”listen” to your body .How do you feel when you are full?When you are eating ,notice how your body feels when your stomach feels comfortable ,eating too much will not make you feel comforbable and will make you fat. Fourth, limit (限制) screen time. Screen time is the time you watch TV, DVDs and videos, or using computers. It is good to take more exercise such as playing basketball, swimming and so on. You can't watch TV for more than two hours a day. Fifth, be active. One thing you should do is to know which activity you like best. Find ways to be active every day. Follow these rules and you can be a healthy kid.
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及孔口局部损失系数ζ。