The weather is too cold for them to be going out. The weather is too cold for them to go out.
题目
The weather is too cold for them to be going out. The weather is too cold for them to go out.
这两句是否都可以?
答案
不是吧,第一句不对.
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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