求助逻辑题

whx1862

Q21:
Which of the following most logically completes the passage?


Each species of moth has an optimal body temperature for effective flight, and when air temperatures fall much below that temperature, the moths typically have to remain inactive on vegetation for extended periods, leaving them highly vulnerable to predators.In general, larger moths can fly faster than smaller ones and hence have a better chance of evading flying predators, but they also have higher optimal body temperatures, which explains why ______.

1. large moths are generally able to maneuver better in flight than smaller moths
   
2. large moths are proportionally much more common in warm climates than in cool climates
   
3. small moths are more likely than large moths to be effectively camouflaged while on vegetation
   
4. large moths typically have wings that are larger in proportion to their body size than smaller moths do
   
5. most predators of moths prey not only on several different species of moth but also on various species of other insects
   

Answer:
我怎么觉得应该是A呢，答案是B

gzpg

这体确实比较难；原文给了两个factor，即两种情况：
1。 Each species of moth has an optimal body temperature for effective flight, and when air temperatures fall much below that temperature, the moths typically have to remain inactive on vegetation for extended periods, leaving them highly vulnerable to predators.条件1时说如果气温太低，moth就全部冻住，容易被捕食——就是说大moth和小moth在被冻住的时候，被捕食率是一样的！
2。In general, larger moths can fly faster than smaller ones and hence have a better chance of evading flying predators, but they also have higher optimal body temperatures,
条件2说如果气温适宜，moths能飞的话（没被冻住），大moth的飞行技巧更高，所以能有效避免被捕食——就是说气温高的话，那就是大moth的天下；因为小moth飞行起来更容易被捕食，在一个period内被捕食率很高，逐渐的就只剩下大moth。

选项1阐述了原文的一个事实；这个选项本身没有错，但是作逻辑时要选最优选项；比较下来，2说的结论确实是题目的真实心意；很漂亮的一个选项！

whx1862

太绕了，多谢解释，现在明白了。我的逻辑题总是错很多，花的时间也长。

chachamao

这体确实比较难；原文给了两个factor，即两种情况：
1。 Each species of moth has an optimal body temperature for effective flight, and when air temperatures fall much below that temperature, the moths typically have to remain inactive on vegetation for extended periods, leaving them highly vulnerable to predators.条件1时说如果气温太低，moth就全部冻住，容易被捕食——就是说大moth和小moth在被冻住的时候，被捕食率是一样的！
2。In general, larger moths can fly faster than smaller ones and hence have a better chance of evading flying predators, but they also have higher optimal body temperatures,
条件2说如果气温适宜，moths能飞的话（没被冻住），大moth的飞行技巧更高，所以能有效避免被捕食——就是说气温高的话，那就是大moth的天下；因为小moth飞行起来更容易被捕食，在一个period内被捕食率很高，逐渐的就只剩下大moth。

选项1阐述了原文的一个事实；这个选项本身没有错，但是作逻辑时要选最优选项；比较下来，2说的结论确实是题目的真实心意；很漂亮的一个选项！

-- by 会员 gzpg (2010/4/22 7:50:03)

我觉得这么解释好像更好一点：
在气温低的地方，因为大moth的休眠点低，大moth更容易inactive-更容易被predator吃掉－大的活下来的少，小的多－在气温高的地方大moth会多一些

garnettcuidifan

chachamao 发表于 2011-5-6 22:56
这体确实比较难；原文给了两个factor，即两种情况：1。 Each species of moth has an optimal body temp ...

better explanation

robinzhcool

尝试分析一下，欢迎讨论哈~
题干先说每种蛾子都有一个最佳飞行体温。然后说，气温低于最佳飞行体温时，蛾子就会长期休眠，更可能被吃掉。结论说大蛾子（由于飞得快）不容易被捕食者吃掉。但是大蛾子需要一个更高的最佳飞行体温才能飞得快，题目问解释。所以正确答案一定是给出一个帮助大蛾子达到更高的最佳飞行体温的条件。

SUSUWH

终于明白了，楼上解释很简洁明了，谢谢！