The development of industry has been ________ gradual process throughout ______

题型：不详难度：来源：

The development of industry has been ________ gradual process throughout ______ human existence from stone tools to modern technology.

A．不填；the

B．the; a

C．a; 不填

D．a; a

答案

C

解析

本题考查冠词的用法。第一空process是可数名词，第一次出现一般用不定冠词，且此次表示“一个”的概念；第二空existence是不可数名词，其此处表示抽象概念，故用零冠词。