Yesterday,I visited a school in Taiyuan.There are about ()students in it

Yesterday,I visited a school in Taiyuan.There are about ()students in it

题目
Yesterday,I visited a school in Taiyuan.There are about ()students in it
A.two thousand B.two thousands C. two thousands of D.two thousand of 各位高手,怎么区分的,答案是A
答案
有 thousands of
two thousand 固定用法 后面不加s 或 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.
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