Where did you go this summer?
题目
Where did you go this summer?
答案
I have been to many placas.Such as,i have been to my grandmother's home,i played with my sister,we were very happy that day.And i have been to ZhongShan Park with my father,we flied kite,it's very interesting.So I have a happy summer holiday.
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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