"All hope was not lost. " means "__________."[ ]

A. There was no hope at all          

B. Hope was everywhere

C. No hope was lost                

D. Not all hope was lost

下列变化属于化学变化的是

A．石油分离出汽油、煤油和柴油等

B．煤焦化产生焦炭、煤焦油、焦炉气等

C．工业上分离空气制取氧气、氮气

D．膜法和热法淡化海水