求教 Prep07-Q32 一道BF题目分析

iamjasmineshi

Paleontologist:
1.About 2.8 million years ago, many species that lived near the ocean floor suffered substantial population declines.大概说的是background info。
2.These declines coincided with the onset of an ice age. 承接第一句。
3.The notion that cold killed those bottom-dwelling creatures outright is misguided, however; temperatures near the ocean floor would have changed very little. 提出大概观点，寒冷完全的杀死海底生物这个观点是错误的。海底温度变化很少。
4.Nevertheless, the cold probably did cause the population declines, though indirectly. 提出真正的观点，顺承上一句，但是寒冷间接的杀死了海洋动物。这个是全文的结论。
5.Many bottom-dwellers depended for food on plankton, small organisms that lived close to the surface and sank to the bottom when they died.  开始解释：什么是浮游生物。
6.Most probably, the plankton suffered a severe population decline as a result of sharply lower temperatures at the surface, depriving many bottom-dwellers of food.给出了终极解释。

(A) The first introduces the hypothesis proposed by the paleontologist; the second is a judgment offered in spelling out that hypothesis.   第一部分是作者的中心观点，可以被称为hypo，第二部分是作者的阐述。
(B) The first introduces the hypothesis proposed by the paleontologist; the second is a position that the paleontologist opposes. 第二部分没有oppose。两个部分是一个立场。
(C) The first is an explanation challenged by the paleontologist; the second is an explanation proposed by the paleontologist. 第一部分作者没有challenge，第二部分正确。
(D) The first is a judgment advanced in support of a conclusion reached by the paleontologist; the second is that conclusion. 应该是第二部分支持第一部分。
(E) The first is a generalization put forward by the paleontologist; the second presents certain exceptional cases in which that generalization does not hold. 第二部分没有提出exceptional cases，同时也是作者支持的，因为这是对conclusion的解释，所以does not hold错。