46According to the passage, which is the best solution to energy problems?
(A)Improving conservation efforts
(B)Inventing fuel-free appliances and vehicles
(C) Increasing the efficiency of appliances and vehicles
(D) Searching for alternative energy sources
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統計: A(7), B(15), C(19), D(45), E(0) #864355
統計: A(7), B(15), C(19), D(45), E(0) #864355