[求助]有几个词实在搞不清，牛人救我

dreadpower

number是修饰可数名词？？
      
     amount修饰不可数名词？？

      那quantity呢？？

      less修饰不可数名词？？但经常有less than 1000 dollars？？这里美圆不是复数吗？

      fewer修饰可数名词？？

gemj

quantity单数、复数均可：
He had consumed a large quantity of alcohol.
Cyprus is the most important location for unearthing large quantities of salable artifacts.

less一般修饰不可数，但也可以修饰可数：
164.    Because natural gas is composed mostly of methane, a simple hydrocarbon, vehicles powered by natural gas emit less of certain pollutants than the burning of gasoline or diesel fuel.
(A) less of certain pollutants than the burning of gasoline or diesel fuel
(B) fewer of certain pollutants than burning gasoline or diesel fuel do
(C) less of certain pollutants than gasoline or diesel fuel
(D) fewer of certain pollutants than does burning gasoline or diesel fuel
(E) less of certain pollutants than those burning gasoline or diesel fuel
E
其他的几个都对。

dreadpower

谢谢斑竹