能增加冠脉血流量的最重要成分是
A．二氧化碳
B．乳酸
C．缓激肽
D．前列腺素
E．腺苷
参考答案：E
When I was young, I ______ get up at 5 and go for a long tiring walk to school after breakfast. [ ]
A. would
B. would like to
C. was used to
D. might
成人辅助性治疗在开拓失牙间隙后如采用种植修复，应在去除矫治器后何时进行修复（）
A.保持半年
B.保持1年
C.保持1～3个月
D.即刻种植
E.保持4周
