問題詳情

53. The greenhouse effect____.
(A) did not have an influence on the earth until the Industrial Revolution
(B) does nothing but harm to humanity
(C) keeps the earth warm
(D) causes the carbon dioxide concentration in the atmosphere to increase

參考答案

答案:C
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)

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