问题补充：
There are about teachers and students in their school.
A. three thousands
B. three thousand
C. thousand of
D. three thousand of
答案：
A. three thousands
(答案→)B. three thousand
C. thousand of
D. three thousand of
解析：英语中数词表示概数时，后面加s，和介词of搭配使用。用原形时表示具体数字和数词搭配使用。句意：在他们学校大约有三百老师。结合语境可知本句表示具体数字，故选B。
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