阿摩線上測驗
33. Although the scientists have ways of warming up Mars, it will take a long time before the planet is _____ for humans to live on.
(A) correct
(B) reasonable
(C) reserved
(D) suitable
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統計： A(1), B(1), C(2), D(18), E(0) #3487971
統計： A(1), B(1), C(2), D(18), E(0) #3487971
