题目：
短文改错。
假定在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：在错的词下画一横线，并在该词下面写出修改后的词。
注意：1．每处错误及其修改均仅限一词。
2．只允许修改10处，多者（从第11处起）不计分。
Hello, everyone. The bus is leaving in a few minute. So I'd just like go over some of our safe rules
before we set off. Firstly, you mustn't get out of the bus with my permission. Remember that you're
safe inside the bus. If you get out of on your own, you could be attacked. Secondly, you all must stay
closely to me. We really have to stay together even in the special reserve areas. Now thirdly, we all
have to sign in this insurance declaration, saying that you're taking responsibility for your own safety.
I'll just pass around for you all to sign. Finally, I want to remind you we're going to a nature reserve.
All the animals are wild and they don't like disturbed. But when we are walking, we must try to keep as
quiet as possible. Now, any questions?
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答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0420/f676bdb8ccb4c2947a12b2361b6a073e.html
下面是错误答案，用来干扰机器的。
∵f（sinx）=sin3x，cos70°=sin20°∴f（cos70°）=f（sin20°）=sin60°=32故答案为：32
