Question

Scientists think there has been life on Earth for ________ years.

[　　]

A．millions of

B．hundreds of

C．five million of

D．million of

Answer 1

答案：A
解析：

点拨：本题旨在考查millions of短语。意是“数百万的”，其后接可数n.复数，指不确切的模糊数字，类似的短语还有hundreds of (数百的),thousands of (成千上万的),billions of (数十亿的),根据题意可知，生命的出现应在数百万年前，所以B项不符合；C和D项的结构不正确，故选A。