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处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。（10分）

增加：在缺词处加一个漏字符号（∧），并在下面写出修改后的词。

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。

Dear Sally,

    Now I'd like to tell you something about my part-time job this summer vacation, of which I worked like a guide in a travel agency.The work was interesting but tired. I think it was helpful to work this holiday. It was the first time that I have earned money on my own.I've come to understand how hard my parents work to support for the family. I used to keep on ask them for money, but now I'll never waste money and learn to share worry with my parent. I've learnt how to get along well with others.

    What's worse, I've gained some working and social experience and I have learnt something can' t be learnt from textbooks. All these will be good for my future. In a word, I had the wonderful and valuable summer vacation.

Yours,

Li Bing

设N_A为阿伏加德罗常数的值，下列叙述不正确的是

下列句子中加点的成语使用有误的一项是
改革开放30年，经济高速发展的中国固然（3分）
令世人刮目相看，但是，部分地区却以牺牲环境为代价换取经济增长；这种饮鸠止渴的做法最终伤害的还是人类自身。印度博帕尔事件、日本水误事件、美国多诺拉事件，无一不是前车之鉴。谁都不希望这些悲剧在中国重演。好在国人已越来越关注环境问题，随着可持续发展观念的深入人心，相关的法律法规也呼之欲出了。

我国政协第十一届全国委员会第二次工作报告指出，人民政协是大团结大联合的象征，是密切海内外同胞关系的桥梁和纽带。这表明人民政协的性质是（   ）

设A={x|x=2k，k∈Z}，B={x|x=2k+1，k∈Z}，C={x|x=2（k+1），k∈Z}，D={x|x=2k﹣1，k∈Z}，在A、B、C、D中，哪些集合相等，哪些集合的交集是空集？