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In the library’s warehouse, robots would...

In the library’s warehouse, robots would manage stock and fetch books ______.

A.on board B.on watch C.on demand D.on occasion

 

C 【解析】 考查介词短语辨析。句意:在图书馆的仓库里,机器人会管理库存和按需取书。A. on board在火车(或轮船、飞机)上; B. on watch警戒,值夜;C. on demand一经要求;承索; D. on occasion偶尔;间或;有时。根据robots would manage stock and fetch books,结合常识,可知这里意思是“按需取书”,故选C。  
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参考词汇:specialty 特色菜

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