In other cultures, looking thin for a husband-to-be is not        a woman desires at all, but looking a little overweight is considered more attractive.

A．which

B．whether

C．that

D．what

热水瓶中的热水未灌满就盖紧瓶塞，第二天，你会感到将瓶塞拔出来很吃力．下列有关瓶内气体（视为理想气体）说法正确的是（　　）

A．温度降低，压强减小

B．体积减小，压强增大

C．对外做功，内能减小

D．释放热量，内能不变