why is the environment polluted so badly one reason is that the number of people who _cars _rising
题目
why is the environment polluted so badly one reason is that the number of people who _cars _rising
A owns are B owns is C own is D own are
答案
c
people是集体名词,动词用原形
the number是单数,所以be 动词用is
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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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