gwd-7-21

yangtingno1

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
   

LES

以下是引用yangtingno1在2004-9-10 16:53:00的发言：
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 ______.

B. large moths are proportionally much more common in warm climates than in cool climates

１.气温与体温match　－>　有效飞行；
２.当气温　<<　体温　－>　不能有效飞行，且易被捕食；

３.大娥比小娥飞得快　－>　大娥逃生能力强；

４.大娥的最佳体温　>>　小娥的；

－> 大娥需要相应的比较高的气温环境，以保证他们的有效飞行，所以推出B选项，大娥通常在暖温气候地区。

apple01

And also in cool climates, larger moths have to stay on vegetation for more time than small moths, increasing the risk of being predated. Thus, larger moths are less common in cool climates.

zhaoshujuanw

LES  did good job.I wish I could like you one day. and thank you

ethyl

also in cool climates, larger moths have to stay on vegetation for more time than small moths, increasing the risk of being predated. Thus, larger moths are less common in cool climates.

赞，非常好，ETS绕弯啦

xinfaxian

以下是引用ethyl在2005-5-23 20:31:00的发言：

.

ETS绕弯啦

同意，这道题目绕了一个弯，当中增加了一层assumption-"becasue big moths cannot survive better in cooler places",所以explains了相对它们在warmer的地方较多。

ETS 够阴的，这题在real test肯定让偶跌跟头。。。

afcyrus

麻烦NN解释一下为什么C错了，我第一感觉也是B的，但后来看到B有新名词temperature,就选C了

foreinter

没注意体温和空气温度的区别，晕。

amy9301

steveyangxt

以下是引用apple01在2004-10-11 6:42:00的发言：
And also in cool climates, larger moths have to stay on vegetation for more time than small moths, increasing the risk of being predated. Thus, larger moths are less common in cool climates.

对， 寒冷地区的大蛾子造就死悄悄了 赫赫