Two years later，her father disappeared，never________again.[ ]

A．to be heard from  

B．being heard from

C．heard from  

D．hearing from

下列哪种毒物中毒可使口唇粘膜呈樱桃红色

A．蛇毒

B．农药

C．二氧化碳

D．一氧化碳

E．来苏