谁有牛津英语上海办7A第31页课文
题目
谁有牛津英语上海办7A第31页课文
答案
One day ,when Ben was walking with Jan in the street ,a motorcycle came toward .Ben and knocked him down the motorcycle caught fire .Both Ben and the motorcyclist were hurt .Sam ran away because he was afraid.
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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