.What do you think was or is the happiest time for you at university?Why?
题目
.What do you think was or is the happiest time for you at university?Why?
答案
the dormitory days.i'm sure i will miss those friends after i graduate from school.we've been together for 4 years.we share happiness and sorrows .those days are precious treasure for me that i will never forgret.
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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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