标题: XDF练习题 [打印本页] 作者: sbbi 时间: 2003-9-16 10:17 标题: XDF练习题 Coservationists have believed that by concentrating their preservation efforts on habitats rich in an easily surveyed group of species, such as birds, they would thereby be preserving areas rich in overall species diversity. This belief rests on a view that a geographical area rich in one group of species will also be rich in the other groups characteristic of the entire regional climate zone.
Which of the following findings about widely scattered tracts 10 kilometers by 10 kilometers in a temperate climate zone would most seriously challenge the conservationists' assumptions?
a) The tracts show little damage from human intrusion and from pollution by human activities. d) There is little overlap between the list of tracts that are rich in species of butterflies and the list of those
The answer is D. Why?作者: 八戒 时间: 2003-9-16 10:52
我试一下： thereby be preserving areas rich in overall species diversity和a geographical area rich in one group of species will also be rich in the other groups characteristic of the entire regional climate zone的概念是一样的！!
D中说明了：rich in species of butterflies就是指前面的an easily surveyed group of species, such as birds 因为和rich in overall species diversity没有overlap ，所以是weaken！