問題詳情

21. Among all the greenhouse gases, carbon dioxide (CO2) is considered most ________ for global climate changebecause of its huge emission amount.
(A)responsibility
(B) responsible
(C) responsibly
(D) responsive

參考答案

答案:B
難度:適中0.532915
統計:A(73),B(170),C(39),D(37),E(0)

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