GWD7-Q21 没讨论过,有人能说说吗?

raphael1234

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 ______.

 

A.    large moths are generally able to maneuver better in flight than smaller moths

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

C.    small moths are more likely than large moths to be effectively camouflaged while on vegetation

D.    large moths typically have wings that are larger in proportion to their body size than smaller moths do

E.     most predators of moths prey not only on several different species of moth but also on various species of other insects

 答案选B的,有人能解释下吗?想了好久没明白

xfi883

原题大意：

如果体温低于要求水平，moth非常容易被捕杀

大moth对体温要求更高，但更容易躲避捕杀，是因为——

答案B：大moth生活在温带地区，可以维持体温需求，躲避捕杀。

raphael1234

以下是引用xfi883在2009-7-13 10:19:00的发言：

原题大意：

如果体温低于要求水平，moth非常容易被捕杀

大moth对体温要求更高，但更容易躲避捕杀，是因为——

答案B：大moth生活在温带地区，可以维持体温需求，躲避捕杀。

谢谢~恍然大悟

INCHASEDREAM

XFI883 6月8日注册及为版主，果然厉害。