《矛与盾》改写作文怎么写？

初夏的清晨，太阳刚刚爬上山头，集市上早已熙熙攘攘了。街道两旁的小摊鳞次栉比，商品琳琅满目，有卖西瓜的，有卖兵器的，有卖蔬菜的，有卖姑娘用的胭脂水粉的……叫卖声和讨价还价声此起彼伏。
听，远处传来了1阵洪亮的吆喝声：“卖盾卖矛喽……非常坚硬的盾，特别锋利的矛……”放眼望去，原来是1位长满络腮胡子，穿着土布褂子，露着胸毛的大伯，左手拿着盾，右手握着矛，亮开嗓子叫卖着。他的周围渐渐地聚集了1群人，显然是他那响亮的叫卖声产生了磁力。看到人越聚越多，大伯神采飞扬。他铆足了劲吆喝道：“我的盾是无比坚硬，任何物体都不能穿透它，快来看快来买啊……”听了他对盾的夸赞，众人仔细观察他手中的盾，议论纷纷。有的说：“是啊，是啊，这块盾的确不错！”有的竖起大拇指：“确实是块好盾牌，战场上用它定能安全护身！”大伯听了人们的称赞，越发得意了，便不假思索地举起右手的矛，向人们“秀”了“秀”，继续夸道：“我的矛锋利极了，它能穿透世间万物，无坚不摧。”“是啊，你瞧这矛头晶莹光亮，1看就是好货色！”1群人又随声附和开了……大伯那个高兴啊，心里盘算着：今天的生意准行！正在大伯得意忘形，大伙正要解囊时，1位站在人群中默不做声的老大爷不紧不慢地问道：“那么，用您的矛刺您的盾，结果将如何呢？”那位大伯1听问话，顿时傻了眼，嘴巴张得如圆饼大，似乎要1口吞下自己手上的盾牌，整个人在刹那间僵住了，成了1尊雕像……等围观的人咀嚼出老大爷的'话意后，集市上响起了1片笑声。那些好事的小孩则1边笑着1边拍掌……
大伯在众人的笑声中，红着脸低着头收拾完兵器，匆忙离开了……
Test 1
Part IWriting:
A Letter of Gratitude
Dear Mary,
Many thanks to you for your timely help with my preparations for the CET-4.
Originally I only wanted to ask you for some advice on the coming test, as you were so good at English.But to my surprise, you gave more help to me than I had ever expected.You not only gave me some suggestions but also showed me how I could arrange my time and what I should do in each month before the test.Besides, you lent me the book I needed very much when you learned that I had not yet got it.It was really kind and considerate of you.
Your unreserved help enabled me to make efficient preparations and at last encouraged me to pa the test.I really owe all my succe to you.So I would like to extend my heartfelt gratitude again.
Yours truly
Sally
写作思路提示：
第一段：开门见山表达谢意。
第二段：稍加说明感谢原因，并举例说明具体帮助。
第三段：说明帮助所起的作用以及再次感谢。
Test 2
Part IWriting:
Why Do People Keep Pets?