产气荚膜梭菌属于（）

A.革兰阳性杆菌

B.革兰阴性杆菌

C.革兰阳性球菌

D.革兰阴性球菌

E.球杆菌

—Did you hear _______ in your room?

—No, I didn't. [ ]

A. anything unusual  

B. something unusual

C. unusual anything     

D. unusual something