Did you hear just now?
题目
Did you hear just now?
Did you hear just now?
A a noise B noise
为什么?noise不是不可数名词么?
答案
A
noise可作可数名词,再如:Do you hear those strange noises?
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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