H7N9禽流感是今年在我国部分省市出现的一种传染病．对此，我们采取了许多有效措施，以下哪条措施属于控制传染源(    )

短文改错 。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：在缺词处加一个漏词符号(＾)，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(从第11处起)不计分

    Hi, Joe. I have read about your situation. This is common for everyone to have arguments or even quarrels with friends. So take it easy, and find the way out.

    You may follow my suggestions. First, try to find out that who did wrong and cause the arguments. If it is you, be brave enough to say sorry for your friend. And unless it is your friend, you shouldn't be too hard on him or her either. Instead, try to taking it easy and be kind. Second, give yourself and your friend some times to calm down, as it is not necessary to solve the arguments immediate.   

    Good luck, best wishes for you!