OG13-CR-59对于正确选项的疑惑

MichaelRen

When there is less rainfall than normal, the water level of Australian rivers falls and the rivers fl ow more slowly. Because algae whose habitat is river water grow best in slow-moving water, the amount of algae per unit of water generally increases when there has been little rain. By contrast, however, following a period of extreme drought, algae levels are low even in very slow-moving river water.

Which of the following, if true, does most to explain the contrast described above?

A During periods of extreme drought, the populations of some of the species that feed on algae tend to fall.
B The more slowly water moves, the more conducive its temperature is to the growth of algae.
C When algae populations reach very high levels, conditions within the river can become toxic for some of the other species that normally live there.
D Australian rivers dry up completely for short intervals in periods of extreme drought.
E Except during periods of extreme drought, algae levels tend to be higher in rivers in which the fl ow has been controlled by damming than in rivers that fl ow freely.

原文指出algae在slow-moving环境下生长的更多，原文最后要让我们解释的是为什么“algae levels are low even in very slow-moving river water”，这一句话明确指明了题目的考虑范围是在有water（水流）的情况下吧，D选项都干成dry up了，都没water了，不在题干的考虑的前提范畴下吧。虽然其他选项也都有问题，但我觉得这个正确选项也挺奇怪，我很快就排除掉的了。跪求大神帮忙解答一下！感激不尽！

我从没去过纽约

The correct answer is C?

MichaelRen

我从没去过纽约 发表于 2015-7-14 23:07
The correct answer is C?

D is the correct answer.

我从没去过纽约

没有水了还怎么活。。完全改变了生存环境啊。。生存环境没有了 自然就减少数量了

alzn2765

你这么理解就是完美的跳到出题者给你挖的坑里。

从出题者的角度考虑，不设坑怎么迷惑考生？他说水流怎么慢，就是让你把思维限制在“必须有水”这个前提下，这是美国人的惯用思维：迷惑以掩盖真实意图。

看过《兄弟连》等战争电影美国步兵班夺要地的基本战术是什么？肯定不是撸开袖子兄弟们！奔跑吧！

正面虚假攻击吸引敌人注意力(distraction)，侧面包抄( outflank)。

distraction--->hide answer
这题是一个套路。

MichaelRen

alzn2765 发表于 2015-8-6 11:02
你这么理解就是完美的跳到出题者给你挖的坑里。

从出题者的角度考虑，不设坑怎么迷惑考生？他说水流怎么慢 ...

看一下！               

MichaelRen

alzn2765 发表于 2015-8-6 11:02
你这么理解就是完美的跳到出题者给你挖的坑里。

从出题者的角度考虑，不设坑怎么迷惑考生？他说水流怎么慢 ...

好的。太感谢了！感觉明白一些了！

Xiaqingsami

首先这是solve the paradox的问题，一般答案会adress premise和conclusion both..原文说algea grow best,注意是best...在low water flow的情况下。。答案D的意思是说都没有water flow了肯定物种数量就降低了。

junichishi

你这个是OG13-59吗 61吧