tom,a boy,12,years,old,his ftiend,jack,collect,stamps,look,beautiful,the great wall,组成一篇短文
题目
tom,a boy,12,years,old,his ftiend,jack,collect,stamps,look,beautiful,the great wall,组成一篇短文
答案
Tom is a 12-years old boy, He has a friend named Jack who likes to collect stamps. Among Jack's beautiful stamps, there is a stamp about the great wall.
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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