短文改错。

     文中共有10处语言错误，每句中最多两处。错误涉及一个单词的增加、删除或修改。

     增加：在此处加一个漏字符号（∧），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：在错的词下划一个横线，并在其下面写出修改后的词。　　

     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（从十一处起）不计分。

      I am an university student. I once thought life at university is excellent, but now I changed my mind. I

have three roommates, and I was the last one move into the dormitory. Last term, we got along peaceful and

happily. But I find they are not willing to be with me now. They don't talk with me, and they 've become even

cold towards me than before. Many time, I wanted to talk with my roommates about that how I felt, but I

failed to find an opening. When leaving alone, I always recall this sadness. I am an honest student. Why can

I win true friendship?

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坚持以科学的世界观和方法论分析治安形势和制定政策，这是公安决策正确的( )。

A．有力保证

B．根本保证

C．思想武器

D．重要依据