患儿，男性，7岁。上颌乳中切牙脱落3个月，恒中切牙一直未萌出。患儿发育正常，颌面部对称。
处牙床饱满，牙龈颜色正常，X线片见有恒牙胚。临床处理宜选择（）
A.切开导萌
B.增加营养
C.观察
D.局部用药
E.修复治疗
参考答案：C
解析：乳恒牙的替换是一种正常的生理过程，通常而言上颌恒中切牙平均在7岁左右开始替换，乳牙脱落继承恒牙在半年之内萌出都是正常的。患儿发育正常，X片显示有恒牙胚，且未到恒牙迟萌的时间，不需要牙齿导萌，暂时观察。
| 根据对话的情景，从方框中选择适当的句子填在画线处，使对话完整通顺。 | |
| Jane: Tomorrow is Saturday. What do you often do on weekends? Bill: 1 What about you? Jane: I often go to the movies. Bill: 2 How often do you go to the movies? Jane: 3 Bill: What's your favorite movie? Jane: 4 Bill: Who do you often go with? Jane: 5 Bill: Are you going there this weekend? Jane: Yes, do you want to go with us? Bill: Sorry, I have a lot of work to do.
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