The final examination of this term is coming, so every one of us ________ for it these days[ ]

A．has prepared  

B．prepared

C．has been preparing  

D．was preparing

A、B两物体的温度相同，A的质量是B的2倍，A的比热是B的1／4，它们吸收相等的热量后再接触，则热量将从_______物体传递给______物体。