阿摩線上測驗
3 As one source of human-induced global warming, airplanes ____large volumes of greenhouse gases.
(A)permit
(B) shovel
(C)emit
(D)vanish
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統計： A(6), B(3), C(29), D(9), E(0) #742794
統計： A(6), B(3), C(29), D(9), E(0) #742794
