問題詳情
【題組】42. Why does the author mention “unique properties” of tree species?
(A)To explain why pests tend to target specific tree species
(B) To explain why pests can have long-term effects on entire ecosystems
(C) To explain how pests contribute to shifts in forest species composition
(D)To explain how pest are able to become established in an ecosystem
參考答案
答案：C
難度：困難0.267
書單：沒有書單，新增