Which is your favourtite day in the year.对还是Which is your favourtite day in a year对
题目
Which is your favourtite day in the year.对还是Which is your favourtite day in a year对
答案
Which is your favourtite day in a year应该是这个对 因为in the year有特指某一年 而最喜欢的一天应该是每一年都有……
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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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