The students are having an English class in the classroom
题目
The students are having an English class in the classroom
The students are having an English class in the_______(classroom/classrooms).这里是用哪个?
Don't eat in the classrooms.为什么这里classroom加S
答案
第一个用classroom,因为同学们都在一个教室里上同一个课.
第二个就是泛指,所有的教室里都不能吃东西,所以用复数.
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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