阅读大全20/63 第7题 求助

chszx63

(50) tative propagation, and a dependence on a small number of insect-pollinator species. Perhaps we should give special attention to the conservation of such plant species since they lack key factors in their defenses against the envi-ronmental disruption caused by pesticide use.
7.Which of the following assumptions most probably underlies the author’s tentative recommendation in lines 51-54?
(A) Human activities that result in environmental disruption should be abandoned.
(B) The use of pesticides is likely to continue into the future.
(C) It is economically beneficial to preserve endangered plant species.
(D) Preventing the endangerment of a species is less costly than trying to save an already endangered one.（B）
(E) Conservation efforts aimed at preserving a few well-chosen species are more cost-effective than are broader-based efforts to improve the environment.
想问一下为什么答案不是A呢？请大家指教，谢谢!

朵拉

怎么木有人回答？？我也疑惑呀~~~