问题

［A］ New plants and animals then move i

［A］ New plants and animals then move into the area and begin to grow.

A［B］ Just 2 percent of the sunlight goes through the many layers of leaves and branches above, so understory plant species have developed special traits to cope with low light levels.
B［C］ On a smaller scale, large mammals, such as elephants, regularly destroy rain forest vegetation in the Congo River Basin in Africa.
C［D］ An understory of shorter trees and a lacework of woody vines, or lianas, produce a forest of such complex internal architecture that many animals, including some sizable ones, rarely or never descend to the ground.
D［E］ Less than one percent of the trees in the forest reside in the canopy and emergent layers.
E［F］ Because more light penetrates the canopy, however, the vegetation of the understory and forest floor is better developed than in the tropics.
F［G］ The rich, green canopy is teeming with life, and forest researchers have developed ingenious methods for accessing this mysterious ecosystem.

参考答案

参考解析：

本题考查的知识点是：上下文的衔接+词语的呼应本题空格出现在第三段中。上文介绍了在热带雨林最上层的新生树木的特点。下文只有一句话，其中出现了表转折的逻辑词however和代词these trees。从文章结构看，第一至三段已经依次介绍了热带雨林的下层、中层、冠层和最上层，因此本题空格处不应该再回过去只谈论下层或冠层。与上文内容能很好衔接的只有［E］，它直接提到了“新生树木层”；而且它的内容与下文也能构成转折，即，虽然树较少，但是都很粗壮。

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