—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

流感的治疗（）

A.解热镇痛药物

B.支持治疗

C.儿童患者可应用阿司匹林解热镇痛

D.有效控制继发细菌性肺炎

E.应用金刚烷胺有抑制甲型流感病毒的作用