50. Which of the followings would be the best title for this article?
(A) Turning Air into Green Gold.
(B) The Fatal Effects of Industrial Emissions.
(C) The Greenhouse Gas Effect at a Glance.
(D) Green Energy for the Steel Industry.
(E) Circular Economy Explained.

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統計： A(36), B(1), C(1), D(4), E(12) #3102091

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#5970952
(A) 將空氣變成綠金。(B) 工業排放...

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