問題詳情
6. Lately many people have been discussing how to ensure______ water, food, energy, and othernatural resources for a large world population.
(A) extreme
(B) individual
(C) respective
(D) sufficient
參考答案
答案：D
難度：適中0.543071
統計：A(38),B(50),C(34),D(145),E(0)