古时候，12只羊可换4只猪，10只猪可换2头牛，16只兔可换2只羊。1头牛可换（ ）只羊；3只猪可换（ ）只兔子。

古时候，12只羊可换4只猪，10只猪可换2头牛，16只兔可换2只羊。1头牛可换（ ）只羊；3只猪可换（ ）只兔子。

一牛换十五只羊，三猪可换七十二兔子

有这样一则故事：在唐太宗贞观年间，在一个磨坊里，有一匹马和一头驴成了好朋友，马在外面拉货，驴在磨坊

My dream is to become a teacher,and it will be not an easy thing to do. why doI want to be a teacher? first, being a teacher has been one of my dreams since my childhood. when I was a small boy,I saw our village education condition was limited because our village was so poor. it was often dropping from the roof when we had lessons.therefore.when I studied in the primary school, my dream had turned to plant in my heart.at that time, I swealed I would change my life because this dream has been hiding in my inner heart.so I do my efforts to make my dream come true.Despite of a lot of difficulty and hardship, i believe my dream will be realized.

试题分析：考查开放性作文。这篇开放性作文给出了一个故事，有部分的文字提示。给考生自由发挥的余地较大。对于考生的综合能力要求较高，要求考生有很强的谋篇布局的能力和组织要点的能力。在完成开放性作文时，首先要选择自己熟悉的短语或者句型，在你的能力范围之内，选择句式时要赋予变化，因为这样你才可以更好的驾驭。同时也要选择合适的连接词，把各个要点组织成一个完整的整体。

【亮点说明】范文中使用了一些词组：do my efforts to努力做…，come true.成为现实，turned to 变成，和一些语法知识：my dream is to become a teacher,and it will be not an easy thing to do.这句话用了不定式做表语和定语， being a teacher has been one of my dreams since my childhood. 这句话用了动名词做主语， despite of a lot of difficulty and hardship, I believe my dream will be realized.这句话用despite表示转折，还有文章还使用了 first,这样的关联词，使文章更加连贯。