四大发明最有用的发明是什么,用途是什么 (用英文写一篇80词左右的作文)
题目
四大发明最有用的发明是什么,用途是什么 (用英文写一篇80词左右的作文)
答案
指南针
The compass
As we all know,there are four important inventions in China,even in the world.They are the results of Chinese people.
But I think the compass is more important than the others.Because of it,we can know our country,our world.With the help of the compass,Christopher Columbus found the new land;with the help of it,we know that the earth is like a ball.Having the compass,we can see the earth clearly.It is the most important invention which is a tool to know more about this world.We can say that without the invention of the compass,there can not be a colourful world.
So,Ido think the compass is more important than the three.
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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