The old couple were so_____in their chess that they didn't hear anybody knocking at the door.    [ ]

A. absorbed    

B. attracted    

C. drawn    

D. concentrated

冬天用一热泵向室内供热，使室内温度保持20℃。已知房屋的散热损失是50000kJ/h，室外环境温度-10℃。则带动该热泵所需的最小功率为（）。

A．0.82kW

B．1.42kW

C．1.64kW

D．1.98kW