下面短文有10处语言错误，请在有错误的地方增加、删除或修改某个单词。

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，在该行右边横线上写出改正后的词。

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

Two years before, I traveled to Brazil and 1 rented for a car. Unfortunate, 1 had an accident and hit another car, and I needed to stay in a hospital for at least two week. I called my parents, so 1 did not tell them what had happened. I knew that they will be worried about myself because I was so farther away, and that my mother would not sleep if she knew. Therefore, I told them interested stories and how 1 was enjoying Brazil. As a result, nobody knew truth. I still think that it was the right thing to do.

判断化学物是否为人类致癌物，具有决定意义的是（）

A.致突变试验

B.细胞转化试验

C.哺乳动物短期致癌试验

D.哺乳动物长期致癌试验

E.人群流行病学调查