Early this year, thousands of migrant _______ workers cancelled their insurance due to the lack of _______ policy to transfer insurance between difference regions.

A．the; the

B．the; a

C．/; the

D．/; a

病人最可能出现

A．麻醉药反应

B．纵隔摆动

C．气胸

D．胸膜反应

E．肺水肿