Children are very happy in the paik.改为感叹句
题目
Children are very happy in the paik.改为感叹句
答案
what happy children who are in the park
how happy the children are in the park
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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