【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(dòng)詞。句意：科學(xué)家估算，在這個(gè)世紀(jì)末，世界人口會(huì)翻倍。number“達(dá)到……之?dāng)?shù)；共計(jì)”，include“包含；包括”，design“設(shè)計(jì)”，以上三個(gè)動(dòng)詞均不合語境。calculate在此意為“估計(jì)”， 所以選C。

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