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    【题目】Scientists have ________ that the world's population will double by the end of this century.

    A. numbered B. included

    C. calculated D. designed

    【答案】C

    【解析】考查动词。句意：科学家估算，在这个世纪末，世界人口会翻倍。number“达到……之数；共计”，include“包含；包括”，design“设计”，以上三个动词均不合语境。calculate在此意为“估计”， 所以选C。

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