Some accidents have happened on the road recently. So we should pay attention to the __________ problems.

A．traffic

B．action

C．path

D．food

一些难溶于水的药物由于第二种物质的加入使其在水中溶解度增加的现象为（）

A.润湿

B.乳化

C.分散

D.助溶

E.助悬