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标题: 一句话，不懂！！！---gwd-7-21 [打印本页]

作者: mmfoolish 时间: 2005-9-7 21:15
标题: 一句话，不懂！！！---gwd-7-21

答案是B,但是我做错了，原因是没看懂最后一句地意思。（but they also have higher optimal body temperatures）

为什么用but?转折什么呢？还有，have在这里是什么意思呢？望各位指教！！！

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 ______.

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

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

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

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

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

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