He insisted that he      from heart trouble, but I didn't think so.   [      ]

A. should suffer    

B. has suffered      

C. suffers        

D. was suffering

阿托品治疗有机磷中毒的主要机理是（）

A.控制毒蕈碱样症状

B.控制烟碱样症状

C.减轻中枢神经系统症状

D.恢复胆碱酯酶活力

E.抑制支气管腺体分泌，解除平滑肌痉挛