問題詳情

52. Which of the following is true about smart roads?
(A) They are not expensive to construct.
(B) They are already being used in many parts of the world.
(C) They are made out of a type of glass.
(D) They can only be used in the winter.

參考答案

答案:C[無官方正解]
難度:適中0.6
統計:A(1),B(2),C(6),D(1),E(0)

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