——This wall of air is an effective answer to the problem and it ____ work.

——But it is a question to put such a wall of air around the statue.

A．may

B．must

C．should

D．could

患者，女，42岁。身热较著，时时振寒，咳嗽气急，胸痛烦闷，咳时尤甚，痰色黄绿、有腥味，舌红苔黄腻，脉滑数。辨证应属肺痈何期

A．初期
B．成痈期
C．溃脓期
D．恢复期
E．发作期