下列各组化合物中，不论以什么比例混合，只要总物质的量一定，则完全燃烧生成H₂O的量和消耗O₂的量不变的是[ ]

A．CH₄O  C₃H₄O₅   

B．C₃H₆   C₄H₆O₃    

C．C₂H₂  C₆H₆      

D．C₃H₈  C₄H₆  

Many of his colleagues eventually agreed that Einstein's theory was tenable.

A．tenuous

B．warrantable

C．redundant

D．tolerable