問題詳情
56. This reading is mainly about ______.((((((((((((((((((((
(A) the history of vending machines
(B) the advantages of vending machines((((((((((((((((((((
(C) the invention of vending machines
(D) All of the above
參考答案
答案：D[無官方正解]
難度：適中0.416667
統計：A(2),B(1),C(2),D(5),E(0)