About 60 percent of the students ______ from the south;the r

应选B.当主语是百分比的时候,谓语动词要与of后的名词一致.当主语是the rest的时候要看它代表的是可数名词还是不可数名词,你得这个句子前面的要看students,后面的them显然代表的是人,可数名词,所以也要以复数对待.又如：Some people have left and the rest are still here.
There is some paper on the desk.You can use some of them.The rest is for others.

选B 因为题中说的是复数形式 用are

b

B