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，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（从第11处起）不计分。

    I was always afraid of water because I nearly get drowned when I was young. As I grew old, this fear was still with me. However, my attitude to water changed last summer. One day, several classmates asked me lean to swim with them, and of course, I said no. But they were quite determined and repeated explained the benefits of swimming for me. So finally I agreed to give them a try. You can imagine what scared I was when I first had stepped into the swimming pool. But gradually, I found it great funs in the water. Now I'm no longer a gird live in fear of water.

一系列物质：NaCl、Cl₂、NaClO、Cl₂O₅、HClO₄是按某一规律排列的，下列组合中也完全照此规律排列的是（　　）

齐国管仲说：“凡为国之急者，必先禁末作文巧。末作文巧禁，则民无所游食，民无所游食则必事农。民事农则田垦，田垦则粟多，粟多则国富，国富者兵强，兵强者战胜，战胜者地广。”某研究者据此得出“中国精耕农业的产生与专制国家农业政策密切相关”的结论。该推断

整数集合{                                                         …}

正数集{                                                          …}

负分数集{                                                        …}

无理数集合{                                                    …}．