类风湿性关节炎病变始于()
成人股骨头无菌坏死病变始于()

A．滑膜

B．肌肉及肌腱

C．软骨

D．骨

E．关节囊

You will soon _____ if you continue working day and night like that.   [ ]

A. break out      

B. break down

C. break away

D. break off