阿摩線上測驗
31. The preservation of the natural ecology requires collective action to combat pollution and promote ________ practices.
(A) superficial
(B) sustainable
(C) superfluous
(D) suspicious
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統計： A(2), B(19), C(2), D(1), E(0) #3930664
統計： A(2), B(19), C(2), D(1), E(0) #3930664
