公安机关是人民民主专政的工具，关系着国家安危和社会稳定，只有在党的正确领导下才能正确发挥其职能作用。 ( )
参考答案：对
He__________ have completed his work; otherwise he wouldn't be enjoying himself by the seaside. [ ]
A. should
B. must
C. wouldn't
D. can't
哮喘的肺气虚弱首选方剂是（）
A.百合固金汤
B.补肺阿胶汤
C.玉屏风散
D.补中益气汤
E.人参五味子汤
