（76-78题共用题干）　　患儿8岁半，冷热刺激疼1周。左上第二乳

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（76-78题共用题干）　　患儿8岁半，冷热刺激疼1周。左上第二乳磨牙近中邻合面深龋洞，叩诊无异常，不松动，牙龈正常。左上第一乳磨牙大面积龋坏探及髓腔，牙根有瘘管。X线片示左上第一乳磨牙根分歧大面积病变。左上4根形成2／3牙囊不完整，其上方骨板消失。左上第二乳磨牙未见根尖病变

左上第二乳磨牙去腐未净露髓请问诊断是什么？采取什么治疗手段

A．深龋，活髓切断

B．深龋，间接盖髓

C．慢性牙髓炎，根管治疗

D．慢性牙髓炎急发，活髓切断

E．慢性牙髓炎，直接盖髓

答案

参考答案：C

阅读理解

Molly	May19, 2009, 9:32pm I think a good friend likes to do the same things as me. Jack is my best friend. We both like to play the guitar after class.
Holly	May19, 2009, 9:40pm For me, a good friend makes me laugh. He or she likes to talk about something interesting and funny.
Maria	May19, 2009 9:45pm I think a good friend should be a good listener ,and he or she should keep secrets for me, that's more important for me.
Sally	May19, 2009, 9;55pm In my opinion, a good friend should have cool clothes, and he or she is popular in school. He or she should be good at sports, because I like doing sports.
Toby	May19, 2009, 10:16pm As we are students, I think a good friend should be good at schoolwork. Then we can help each other, learn from each other.
Jim	May19,2009,10:30pm I think a good friend should help each other. When I am in trouble, Kelly always help me.

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