46. What is the primary purpose of this passage?
(A) To introduce energy alternatives
(B) To encourage innovation and development
(C) To promote fossil fuels
(D) To suggest new technologies
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統計: A(55), B(217), C(14), D(28), E(0) #1308778
統計: A(55), B(217), C(14), D(28), E(0) #1308778