Our new school was built in a beautiful place, around _____ high mountains.

A．which was

B．it was

C．which were

D．them were

下列有关溶液的叙述正确的是  （　　）

A．将植物油与水混合，充分振荡后得到的是溶液

B．配制溶液时，搅拌溶液可以增大溶质的溶解度

C．将120gKCl溶液蒸干得到20gKCl固体，则KCl的溶解度为20g

D．KNO₃中混有少量NaCl，可采用降温结晶法提纯KNO₃