（）this place is usually very big.There are many trees,grass and flowers in it.People often填什么
题目
（）this place is usually very big.There are many trees,grass and flowers in it.People often填什么
接：take exercise in the morning or take a walk in the afternoon there.Maybe there are some lakes in it.
答案
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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