問題詳情

【題組】54 The largest caves are formed in limestone when the
(A) rock is exposed to air.
(B) bigger caves collapse.
(C) water is very acidic.
(D) water is sluggish.

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)