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19.Some scientists believe that there will be more robots in        years.(  )
A.hundreds of B.hundred ofC.two hundreds ofD.two hundreds

分析 一些科学家相信几百年后会有更多的机器人.

解答 正确答案:A.hundred,thousand等数词如表示不确定数目,其常用表达是hundreds/thousands of,后跟可数名词复数.当表达确定数目时,其常用表达是基数词+hundred/thousand,后跟可数名词复数.根据句意一些科学家相信几百年后会有更多的机器人,此处指不确定的数目,则应用hundreds of,故选择A.BCD三项表达错误,两百应是two hundred.

点评 本题考查数词,记住hundred,thousand的基本用法,再根据题干进行选择.

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