____ people went to the concert last night.A,thousand of B,million of C,millions of D,
题目
____ people went to the concert last night.A,thousand of B,million of C,millions of D,
D,five millions of
答案
选C,表示人数多.基数词用复数形式,后加of
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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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