However busy we are, we need to take exercise. Not only _____ us keep healthy, it also stops us getting fat.   [    ]

A. it helps      

B. helps it      

C. it does help    

D. does it help

下列不属于渗出性炎的是（）

A.出血性炎

B.肉芽肿性炎

C.化脓性炎

D.浆液性炎

E.纤维素性炎