腰椎间盘突出症最常见的部位是（）。
A．T12-L1
B．L1-2
C．L4-3
D．L3-4
E．L4-5
参考答案：E
简述竞技能力的非衡结构的补偿效应。
We had wanted to finish our task by noon, but it didn't quite ________ as planned. [ ]
A. carry on
B. carry out
C. work on
D. work out
