where are the pay( )phones括号里填升调还是降调 they are in front of the post( )office
题目
where are the pay( )phones括号里填升调还是降调 they are in front of the post( )office
is there a post office near your ( )house
it is on center( )street
答案
where那个是降调.
they are那个降调.
is there那个升调.
it is那个降调
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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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