男性患者，56岁，2周前发现右下后牙龈有小包，平时无明显不适，右下第一前磨牙咬合面龋深及髓腔，牙髓无活力，叩痛（-），X线片见：右下第一前磨牙根尖透射区不规则，边界模糊。

主诉牙应诊断为（）

A.慢性牙髓炎

B.慢性牙槽脓肿

C.根尖囊肿

D.根尖肉芽肿

E.慢性牙周炎

下面短文中有10处语言错误。请在有错误的地方增加、删减或修改某个单词。

增加：在缺词处加一个漏字符号（∧），并在其下面写上该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写上修改后的词。

注意：1.每处错误及其修改均仅限一词；

2.只允许修改10处，多者（从第11处起）不计分。

Last Sunday afternoon, I went to the zoo with Lily. There was lots of people there. I found

a girl cry in the zoo. She was lost and she can’t find her mother. We decided to help her. I try my

best find the broadcasting station in the zoo. On the same time Lily played with her and looked

after her careful there. The little girl stopped crying and played with Lily. At last his mother

came. That made me feel very happily. I thought I really did a good thing. If everyone helps with

each other, the world will become more beautiful.