因為 a population of 是固定搭配,表示人口是多少
millions of 解釋為“數(shù)以百萬”的.
但是,如果具體地說出二百萬、五百萬等,則 million 后沒有 s ,也不用 of:
例如：two million smokers.
高考題
1. __ people in the world are sending information by E-mail every day. (2001 上海)
A. Several million B. Many millions C. Several millions D. Many million
(A.)
2. Shortly after the accident, two __ police were sent to the spot to keep order. (MET. 1992)
A. dozen of B. dozens C. dozen D. dozens of
(C.)