how long,how much,how many有啥区别?他们的回答有何不同?
题目
how long,how much,how many有啥区别?他们的回答有何不同?
答案
how long 多久,一般回答时间段
如：How long have you been in this school?
I have been here for about two hours.
how much 多少,后跟不可数名词,回答用数量
如：How much water is there in the bottle?
There is little.
How much 还有 多少钱的意思
how many 多少,后跟可数名词复数,回答用数量
如：How many students are there in your class?
There are forty.
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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