22.A non native species might be introduced into a new environment by humans, either intentionally o

問題詳情

22.A non native species might be introduced into a new environment by humans, either intentionally or_____________accident.
(A)In
(B)for
(C)on
(D) by

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)