问题
选择题
More than two _______years ago, people knew little about the universe.
A．thousands
B．thousand
C．thousands of
D．thousand of
答案
答案：B
此题考查名词的量。确切数量常用数词+hundred/thousand/million/billion+名词的复数形式；不确切数量常用hundreds/thousands/millions/billions + of+名词的复数形式.