问题补充：
The government of Chongqing is building cheap and good houses for the people.
A. thousand
B. thousands
C. thousand of
D. thousands of
答案：
A. thousand
B. thousands
C. thousand of
(答案→)D. thousands of
解析：考查数词用法。表示不确切数目时，需在数词词尾加s,后跟of。thousands of意为“成千上万”。句意为“重庆政府部门正在建设为民众建设上万套质量好的廉价房”。故选D。
