阿摩線上測驗
5 The engineer pointed out that the materials are tough and last a long time because of their ____.
(A) elasticity
(B) durability
(C) portability
(D) cost-effectiveness
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統計： A(2), B(15), C(5), D(2), E(0) #3821200
統計： A(2), B(15), C(5), D(2), E(0) #3821200
