急英语问题写个4、5句话
题目
急英语问题写个4、5句话
Do you believe aliens have already visited Earth?
What would you do if you come face-to-face with an alien?
答案
I don't think that aliens haven visited Earth yet.As far as I know,if man wants to travel between galaxies,he must travel at a fast speed,especially near to the velocity of light .And the space outside is so large.So I don't think that aliens haven visited Earth yet.
I will show my friendly to him.And I will take him to my home as a guest.Tell him something about our Earth human beings instead of showing him around .Because I think if I take him around ,there must be a traffic jam all over the Earth!
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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