Ladies and gentlemen, please fasten your seat belts. The plane          .[ ]

A. is taking off          

B. takes off      

C. has taken off      

D. took off

曲霉菌感染属于（）

A.革兰阴性杆菌感染

B.革兰阳性球菌感染

C.无芽胞厌氧菌感染

D.真菌感染

E.病毒感染