Movies used to be shown in the open air in that village, with audience ________ on stones, boxes or

even on the ground. [ ]

A. to sit    

B. sitting    

C. being sat  

D. sitting

有机磷农药中毒，哪种症状出现最早（）。

A.血压升高、心律失常

B.横纹肌纤维束颤动

C.头晕、头痛、疲乏

D.肌力减退

E.副交感神经末梢兴奋的表现