问题补充：
Yesterday, I visited a middle school in Taiyuan. There are about students in it.
A. two thousand
B. two thousands
C. two thousands of
D. two thousand of
答案：
(答案→)A. two thousand
B. two thousands
C. two thousands of
D. two thousand of
解析：句意：昨天，我参观了太原的一所中学。这所学校有两千名学生。分析：具体数词接hundred, thousand, million等，如两百two hundred；表示不具体的数字用hundred, thousand, million……在后面接s和of, 如成百上千的hundreds of .故选A
