阿摩線上測驗
41.In sentence 9 the word “This” refers to _____.
(A) greenhouse effect
(B) carbon dioxide
(C) atmosphere
(D) gas
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統計： A(1055), B(269), C(131), D(58), E(0) #2924969
統計： A(1055), B(269), C(131), D(58), E(0) #2924969
