The development of industry has been_______ gradual process throughout _______ human existence, from stone tools to mod

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1. (2012·浙江) 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

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2012年高考英语真题试卷（浙江卷）