用英文来表示Traffic Rules.
题目
用英文来表示Traffic Rules.
写一篇40字左右的预备班水平的英文文章.
答案
Do you know the traffic rules?
Let's learn it together.there are three color of traffic light:red,green,yellow.We stop at red light and we can go at green light.Yellow light is in the middle.We must remrember the traffic rules!
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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