短文改错(共10小题；每小题1分，满分10分) 

假定英语课上英语老师要求同桌之间互相修改作文，请你修改你同桌的以下作文。

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。

删除：把多余的词用斜线(＼)划掉。 

增加：在缺词处加一个漏字符号(∧)，并在该词下面写出该加的词。

修改：在错的词下划一横线，在该词下面写出修改后的词。

注意：1、每处错误及修改均仅限一词。

2、只允许修改10处，多者(从11处起)不计分。

Dear Jin Jing，

Your problem is common one among middle school students．Maybe the following advices can help you．First in all，believe in yourself．Your greatest problem is that you lack self-confidence．The first thing you must do is to smile at your classmate．One smile speaks loud about your wish to make friends than any word．Your smile will show that you are friendly to him．Next，trying talking with a student who is as shy as you  or who share the same interest as you．You can discuss your studies with a classmate，and you can also talk about your hobbies as well．Unless anyone is in trouble，you should be ready to help him or her．Once you have confidence，you can make as many friends as possibly．

下列哪项不属于工程性基础设施 ( )

A．能源供应设施

B．交通运输设施

C．环境保护设施

D．医疗卫生设施