問題詳情
60. What does the author mainly discuss in the text?
(A) Technology .
(B) Sustainability.
(C) Ethanol energy .
(D) Environmental protection .
(A) Technology .
(B) Sustainability.
(C) Ethanol energy .
(D) Environmental protection .
參考答案
答案：B
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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