— I have been worried about the possible danger of driving on a railway line.

— Do not be afraid; God will ________ us. [ ]

A. turn over  

B. watch over

C. go over  

D. look over

败血症的致病菌主要有（）

A.革兰阴性细菌

B.真菌

C.厌氧菌

D.以上均是

E.革兰阳性球菌