短文改错（共10小题，每小题1分，满分10分）

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1. 每处错误及其修改仅限一词；

2. 只允许修改10处，多者（从第11处起）不计分。

I am so exciting that I can’t wait to share with you what I experienced today. I gave my first lesson in our school, which left me the deep impression.

When I entered into the classroom, my students began to make much noise. I stood on the

platform, knowing what to do at first. But soon I realized everything must be done. I asked the

kids that they liked English songs. They all say “Yes.” I sang a song I had practised many times.  To my great surprise, all the kids turned their attentions to my class.

From this experience I know however happens, we must stay calmly first and find a wise solution.

亚急性感染性心内膜炎青年人常发生于（）

A.正常心脏

B.退行性心瓣膜病

C.风湿性心脏病，二尖瓣狭窄

D.风湿性心脏病，二尖瓣关闭不全和（或）主动脉瓣关闭不全

E.先天性心脏病，房间隔缺损