the amount of 不是修饰不可数名词吗..OG11-62 修饰可数了....

62

A 1972 agreement between Canada and the United States reduced the amount of phosphates that municipalities had been allowed to dump into the Great Lakes.

A. reduced the amount of phosphates that municipalities had been allowed to dump

B. reduced the phosphate amount that municipalities had been dumping

C. reduces the phosphate amount municipalities have been allowed to dump

D. reduced the amount of phosphates that municipalities are allowed to dump

E. reduces the amount of phosphates allowed for dumping by municipalities

答案是D...

我知道THE AMOUNT OF 是修饰不可数的...PHOSPHATE查字典是可以可数也可以不可数...可是加了"S"--PHOSPHATES就肯定是可数了...为什么THE AMOUNT OF修饰能..因为这个我一看这道提就把所有的THE AMOUNT OF ...给删了......

[usually plural]
  
a substance containing a phosphate used for making plants grow better

PHOSPHATES意思是磷酸酯时是可以可数也可以不可数的，只是通常以复数形式出现。在这里应该理解为不可数，但是以复数形式出现。