Read the situations.What do you say?
题目
Read the situations.What do you say?
(1)You answer the door and a friend is standing on the doorstep.How do you invite him or her in?
(2)You have offered to help a friend with some housework.How do you ask what to do?
答案
Come in please.
What can I do for you?
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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