有害气体进入人体造成伤害的途径有（）。

A.血液循环系统

B.呼吸道

C.皮肤

D.消化道

—I can't find my watch.    

—____________.[ ]

A. Excuse me          

B. You can go to the lost and found.

C. OK.                  

D. They are in the case.