问题补充：
No.6. Middle School is very beautiful. There are seventeachers and students in it.
A. thousand of
B. thousands of
C. thousand
D. thousands
答案：
A. thousand of
B. thousands of
(答案→)C. thousand
D. thousands
解析：本题考察数量的表达方法，确切数量的基本构成是基数词+hundred/thousand+名复。切记hundred/thousand要用单数形式。
