49. Energy
(A)efficient light bulbs
(B)increase greenhouse gas emissions. Also, you should flip the light
(C)switch off when you
(D)leave the room.
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統計: A(136), B(254), C(182), D(81), E(0) #2927406
統計: A(136), B(254), C(182), D(81), E(0) #2927406