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：段落内一致性原则+上下文的衔接本题空格出现在第二段中。上文介绍了冠层的功能与高度。下文的内容可概括为：研究人员使用各种各样的手段对冠层进行研究。由此可见，上下文都围绕“冠层”展开论述。出现了关键词“canopy”的选项是［E］、［F］和［G］。［E］中出现了上下文没有的新信息：“新生树木层”，破坏了段落的一致性，该信息实际上到第三段第二句才首次出现。［F］中出现了逻辑词however，但从内容上看，上文与［F］项并不构成转折关系。而且［F］强调的是冠层与下层植被和森林地表植被的关系，与下文也无法衔接。［G］只涉及“冠层”和“研究者”的内容，与上下文都实现了很好的衔接。

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