what is good for us (需要10条）
题目
what is good for us (需要10条）
答案
sleeping
eat an apple
think about postive thing
call your folk in spare time
sing a song
dance with beauty girl
change your phone model to be ipone4s
go shopping crazily
make a friend with some foreigner
make a joke with your friend
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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