阿摩線上測驗
59. The passage implies that alum has maintained relevance across history primarily because
(A) it was the only fire-resistant material available until the 20th century.
(B) it proved effective enough to be adopted by multiple civilizations and remains in use today.
(C) Roman engineers recognized its superiority over all other known materials.
(D) its chemical properties were only fully understood in the modern era.
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統計： A(0), B(1), C(2), D(0), E(0) #3930772
統計： A(0), B(1), C(2), D(0), E(0) #3930772
