module 4 sandstorms in asia
ⅰ.语法填空,单句训练
1.(2014届浙江改编)the development of industry has been ________gradual process throughout ________human existence,from stone tools to modern technology.
答案:a;不填 process是一个可数名词,此处用不定冠词修饰,表示“一个逐步的过程”;第二个空后面的human existence是抽象名词,前面不需要任何冠词。
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