half of + 不可数

half of + 不可数 half与half of, half kilos of rice Half of _____is seven. Six is half of ( ). half of the students half of the apples__good half of them and a half 关于英语中的half of和half half与half of的区别 a half 与half of 的区别? Half后面可不可以连用of,如half of students