—Do the Olympic champions________regularly after the Olympic Games?

—Yes, they do. They'll get fat easily if they don't.[ ]

A. work out  

B. cool off

C. stay up  

D. break off

关节软骨及其下方的骨质为病理组织所侵犯、代替称为（）。

A.关节肿胀

B.关节破坏

C.关节退行性变

D.关节强直

E.关节脱位