用there is,there are; there was,there were 各编2个句字
题目
用there is,there are; there was,there were 各编2个句字
答案
there is milk herethere is a book on the shelfthere are thirty girls in our classthere are no roadsthere was no body therethere was muck everywherethere were none presentthere were heaps of people her...
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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