由上下相邻椎骨上、下切迹围成的结构是()
A.椎孔
B.椎间孔
C.椎间盘
D.棘突
E.横突
参考答案:B
被除数是49,除数是7,商是[ ]
A.7
B.8
C.9
---You never exercise.
---_______. I walk for more than one hour every day.
A.Yes, I do
B.No, I don’t
C.Yes, I am
D.No, I’m not