【題目】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】考查動詞。句意：科學家估算，在這個世紀末，世界人口會翻倍。number“達到……之數(shù)；共計”，include“包含；包括”，design“設(shè)計”，以上三個動詞均不合語境。calculate在此意為“估計”， 所以選C。

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