．The development of industry has been___...

．The development of industry has been________gradual process throughout________human existence，from stone tools to modern technology. (2012·浙江，2)

A．/；the B．the；a

C．a；/ D．a；a

C 【解析】第一空process是可数名词，第一次出现一般用不定冠词，且此处表示“一个”的概念；第二空existence是不可数名词，此处表示抽象概念，故用零冠词。

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