【題目】By not having a child, the carbon footprint of an individual ________ in a developed country would be reduced on average by an extra 58.6 tons of carbon dioxide every year, ________ current emission rates.

A. lived; basing on B. living; basing on

C. lived; based on D. living; based on

【答案】D

【解析】考查非謂語(yǔ)動(dòng)詞。句意：按照現(xiàn)在的排放速率，每少生一個(gè)孩子，發(fā)達(dá)國(guó)家每年的個(gè)人碳排放量將平均額外減少58.6噸。第一個(gè)空是作定語(yǔ)，修飾an individual，“一個(gè)人”主動(dòng)“生活”，故用v-ing形式；第二個(gè)空表示“以……為根據(jù)”，是base A on或be based on，本空是作an extra 58.6 tons of carbon dioxide 的后置定語(yǔ)，base與前面提到的數(shù)據(jù)是被動(dòng)關(guān)系，故用過(guò)去分詞。綜合以上，故選D。

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