I have four cousins.（对划线部分提问）four划线
题目
I have four cousins.（对划线部分提问）four划线
Those are my family photos.（改为否定句）
His football is under the desk.（改为一般疑问句）
答案
Those aren't my family photos.
How many cousins do you have
Those aren't my family photos.
Is his football under the desk?
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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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