英语：填入句子,补全对话.
题目
英语：填入句子,补全对话.
( ).I lost my pencil case.
( It's yellow.
( A pen,a pencil and a ruler.
Look!( Yes,it is.
( ).That's OK.
答案
what's the matter?
what color is it?
what in it?
is it your pencil-case?
here you are.
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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