一道GRE填空求大神解释

题目

一道GRE填空求大神解释
If one could don magic spectacles – with lenses that make the murky depths of the
ocean become transparent – and look back several centuries to an age before
widespread abuse of the oceans began, even the most (i) ____ observer would
quickly discover that fish were formerly much more abundant. Likewise, many now-
depleted species of marine mammals would appear (ii) ____. But without such
special glasses, the differences between past and present oceans are indeed hard to
(iii) ____.







Blank (i)
(A) casual
(B) prescient
(C) clearheaded



Blank (ii)
(D) threatened
(E) plentiful
(F) unfamiliar



Blank (iii)
(G) ignore
(H) discern
(I) dismiss



不懂啊!最好有翻译……

答案

答案是B,E,我的理解是,如果能有一种神奇的眼镜让人们一下子看回到数世纪人类过度开发海洋资源之前,就连最漫不经心（blank 1）的人也能发现当时的鱼比现在多多了.同样,许多现在濒临灭绝的海洋哺乳动物在当时也很丰富...