問題詳情

23．Polar bears live mostly on ________ sea ice, which they use as _______ platform for hunting seals.
(A)a；a
(B)a；the
(C)不填；a
(D)the；不填

參考答案

答案：C
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)