the coffee store has the best service and you can buy coffee the most c()
题目
the coffee store has the best service and you can buy coffee the most c()
----what do you often to do on your () time?
----sometimes i watch tv,sometimes i go online and sometimes i exercise
答案
第二空我觉得应该是free
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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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