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
这题有出现了amount of phosphates, 用amount说明phosphate是不可数的, 但为什么会有复数呢?
phosphate加s可能代表很多种的phosphate，之所以能用amount of phosphates，是因为该句子中，重点关注的是各种phosphate的总量。如果用the number of phosphates，看起来更像是在说phosphate的种类有几种。作者: M猫Fishoo 时间: 2013-8-23 14:07
ls说的好像有点道理耶...