look simon is playing football with his friends in the playground.为什么不是ion the playground
题目
look simon is playing football with his friends in the playground.为什么不是ion the playground
答案
In the playground
on the playground
都可以,都表示”在操场上“
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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