. ---Did he hear of the news that his son sacrificed in the war?

---No. It was   he received the call from the army   he knew it.

A．until, that

B．not until, when

C．until, when

D．not until, that

若多孔性物质能被水润湿，则当水蒸气含量较大时，可首先在该多孔性物质的孔隙中凝结，这是因为（）。

A.平液面的蒸气压小于凸液面的蒸气压

B.平液面的蒸气压大于凸液面的蒸气压

C.平液面的蒸气压大于凹液面的蒸气压

D.平液面的蒸气压小于凹液面的蒸气压