It is dangerous for little children to swim in the river.为什么这里用to swim
题目
It is dangerous for little children to swim in the river.为什么这里用to swim
答案
固定句型
It's + 形容词 + for sb.+ to do sth.
真正的主语是动词不定式 to do sth.
To swim in the river is dangerous for little children.有点头重脚轻,所以用形式主语it
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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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