物理自净作用是（）

A.环境污染物的氧化、还原、分解等

B.环境污染物通过微生物的降解

C.环境污染物自动分解

D.环境污染物通过稀释、扩散、挥发等

E.环境污染物自动降解

_______ you want me to fire you, I suggest you not wear sports clothes in the office next time.

A．As long as

B．As far as

C．Since

D．Unless