two third of rice is produced in the south of china为什么用IS

two third of rice is produced in the south of china为什么用IS
two third of rice is produced in the south of china
为什么用IS

two third of rice is produced in the south of china为什么用IS
rice不可数

因为rice不可数 所以三分之二的米也是要用单数形式的谓语动词