問題詳情
21. The biosphere is a complete, enclosed environment because nothing enters it _____ the sun’s heat entering through theglass or plastic.
(A) exceptionally
(B) except for
(C) additionally
(D) in addition to
參考答案
答案：B
難度：適中0.65
統計：A(1),B(13),C(2),D(3),E(0)