对口号部分提问： He has lived in Shenzhen （ for 3 years）.
题目
对口号部分提问： He has lived in Shenzhen （ for 3 years）.
答案
How many years has he lived in Shenzhen?
How long has he lived in Shenzhen?
How many years has he BEEN in Shenzhen?
How long has he BEEN in Shenzhen?
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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