－Is that your chemistry teacher Miss. Zhang?

－It ______ be her. She has gone to Beijing for a trip. [ ]

A. must

B. can't

C. might

D. need

关于麻风分枝杆菌，叙述正确的是（）

A.体外培养容易生长

B.其菌体较结核分枝杆菌短而粗

C.为胞内寄生菌

D.具有抗酸性

E.无氧较有氧条件下生长好