問題詳情
4. The Internet is a very important _____ of communication. It was once ranked as the most important invention within the last hundred years.
(A) gown
(B) vibration
(C) microphone
(D) instrument
參考答案
答案：D[無官方正解]
難度：簡單0.714286
統計：A(1),B(0),C(0),D(5),E(0)