—Where's my English book? I can't find it. 

—It _____ in your room. [ ]

A. maybe

B. may be

C. could be

D. can be

患者，男，52岁。有多年吸烟史，出现刺激性干咳伴咯血痰。应首先考虑

A．支气管肺癌

B．肺脓肿

C．支气管扩张

D．肺气肿

E．慢性支气管炎