一道英语单选,说明选择理由
题目
一道英语单选,说明选择理由
In the US,advertising revenue( 收益) pays all the direct costs of television and radio broadcasting and ______ 70% of the cost of newspaper publishing.
A.the least of
B.much as
C.no less than
D.not so much as
答案
C 不少于
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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