_______ the stundents in the primary school is about three thousand,and ______of them are girls.
问题描述：
_______ the stundents in the primary school is about three thousand,and ______of them are girls.
填数词
选项：
A.A number of ;two third
B.The number of; two thirds
C.A number of; two thirds
D.The number of; two third
答
all,some
all students被视为一个整体,被视为单数,“其中有些人”some of them被视为复数
B.The numberof; two thirds