We all know that dinosaurs lived on the Earth more than years ago.A. sixty millionB. mil

问题补充：

We all know that dinosaurs lived on the Earth more than years ago.

A. sixty million

B. millions of

C. sixty million of

D. million of

答案：

(答案→)A. sixty million

B. millions of

C. sixty million of

D. million of

解析：句意：我们都知道六千万多年前恐龙曾经在地球上生存。million、hundred等数词在表示具体的数值时，要用单数。millions of则表示数百万的意思。故选A。

考点: 考查数词的用法。