問題詳情

15.Millions of tons of high-tech products are__________each year when they are no longer useful.
(A) invented
(B) purchased
(C) dedicated
(D) discarded

參考答案

答案：[無官方正解]
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)