問題詳情
11. While WHO is confident that Liberia has interrupted transmission of Ebola, outbreaks persist in neighboring Guinea andSierra Leone, creating a high risk that infected people may cross into Liberia over the region’s exceptionally ______borders.
(A) impermeable
(B) tight
(C) overpassing
(D) porous
(E) inapproachable
參考答案
答案：D
難度：困難0.25
統計：A(2),B(1),C(1),D(2),E(0)