lWere you born in Shanghai?---No,——untilI was 3.How long have you been in
题目
lWere you born in Shanghai?---No,——untilI was 3.How long have you been in
Were you born in Shanghai?
---No,——untilI was
How long have you been in Beijing？
Let me see.____since 1998
如何补全对话
答案
Were you born in Shanghai?
No, I didn't live in Shanghai until I was 3.
How long have you been in Beijing?
Let me see. I have been there since 1998.
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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