以A Happy Day为题,写一篇小作文.
题目
以A Happy Day为题,写一篇小作文.
答案
Happy dayToday I am very happy because my mom took me to the swimming pool.I jumped into the pool as soon as I got there,I was very very hot.I swam like a fish,I love swimming,and I like how the water...
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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