请帮助英语病句改正
题目
请帮助英语病句改正
1.our classroom is under second floof.
2.how many computer are there in your school?
3.welcome in our school.this way,please.
4.do you have the lunch at school?
答案
1.under - on the
2.computer- computers
3.in - to
4.the 去掉
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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