the children are going to school on foot.对划线部分提问
题目
the children are going to school on foot.对划线部分提问
答案
没有线呢?
如果对children划线,就是who are going to school on foot?
如果对school划线,就是where are the children going to on foot?
如果对on foot划线,就是how are the children going to school?
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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