____people in the world are send ing information by Email every day
题目
____people in the world are send ing information by Email every day
A several million B many million
several 和many 如何区别呢?
A
答案
many 不可接具体数字,可接a an ,several 相当于几,后可接million
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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