there are ____ of visitors in the exhibition every week.
题目
there are ____ of visitors in the exhibition every week.
A.about three thousand B.about three thousands
C.about ten of thousands D.ten of thousands
为什么选D
答案
的确,应该是tens of thousands,它本来就表示一个大约的数字,所以前面不能加about!要不然,就重复了!
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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