問題詳情
39. The word "it" in line 21 refers to
(A) biological productivity
(B) oil
(C) organic material
(D) petroleum
(A) biological productivity
(B) oil
(C) organic material
(D) petroleum
參考答案
答案：C
難度：非常簡單1
統計：A(0),B(0),C(6),D(0),E(0)
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