There are about thirty()people living in the town.
题目
There are about thirty()people living in the town.
A.thousands B.thousand C.thousand of D.thousands of
答案
B.thousand
三万,后面不用加介词
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．
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