以 To the earth to protect ourselves为题写一篇80词英语文章
题目
以 To the earth to protect ourselves为题写一篇80词英语文章
答案
Now the enbironment of the Earth is getting worse and worse.In some places people pollute the air and water so seriously that it causes lots of problems.Some animals and plants are in danger.Lots of p...
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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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