阿摩線上測驗
28. The main cause of global warming is too much carbon __________ in the atmosphere.
(A) monoxide
(B) hydrochloride
(C) dioxin
(D) dioxide
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統計： A(1), B(1), C(1), D(6), E(0) #3860225
統計： A(1), B(1), C(1), D(6), E(0) #3860225
