We don't go to school __________weekends.[ ]
A. in
B. of
C. for
D. on
答案：D
The old man __________ in Tibet for two years as a volunteer teacher；it is an experience he often mentions.
A．served
B．serves
C．is serving
D．has served
有关骨折急救处理时妥善固定的目的，下列哪项是错误的
A．使移位的骨折得到复位B．避免骨折端在搬运过程中加重软组织损伤C．适当固定可缓解疼痛D．便于运送E．避免损伤骨折邻近的重要血管
