单选题About 60 percent of 

问题补充：

单选题About60percentofthestudents________fromthesouth,therestofthem________fromthenorthandforeigncountries.A.are;isB.are;areC.is;areD.is;is

答案：

B解析分数和rest作主语，谓语的数应与它们后面的中心名词保持一致。