The development of industry has been_______ gradual process throughout _______ human existence, from stone tools to modern technology.
A．不填, theB．the; aC．a(chǎn); 不填D．a(chǎn); a
C
【考點(diǎn)】冠詞—零冠詞和不定冠詞
第一空process是可數(shù)名詞，第一次出現(xiàn)一般用不定冠詞，且此次表示“一個(gè)”的概念；第二空existence是不可數(shù)名詞，其此處表示抽象概念，故用零冠詞。
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