quantity与amount的区别

题目

quantity与amount的区别
The __of the time the students spend at school has been limited to no more than six hours a day for primary students.
A number B sum C quantity D amount 为什么选D不选C呢

答案

quantity
quantity[简明英汉词典]
[ˈkwɔntiti]
n.1 数目,数量 2 量,大小
amount
amount[简明英汉词典]
[əˈmaunt]
n.1 量,数量,数额 2 总额,总数
vi.1 合计,共计 2 等同,接近
比较后可以发现它们的词意并不一样