This makes us pay more attention to our enviroment and (the need) to protect it.
题目
This makes us pay more attention to our enviroment and (the need) to protect it.
为什么是the need 而不是need
答案
the用来特指哪一种需求
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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