GMAT考试资料：GWD试题合集（九）.

　　以下将为正在备战GMAT考试的同学们整理一些经典的GMAT阅读试题，并分多个合集推出，希望能够为正在备考GMAT考试的考生提供或多或少的帮助。

　　5. GWD-5-Q35 to Q37白杨树为什么要惹火烧身呢

　　Even more than mountainside slides

　　of mud or snow, naturally occurring forest

　　fires promote the survival of aspen trees.

　　Line Aspens’ need for fire may seem illogical

　　(5) since aspens are particularly vulnerable

　　to fires; whereas the bark of most trees

　　consists of dead cells, the aspen’s bark

　　is a living, functioning tissue that—along

　　with the rest of the tree—succumbs quickly

　　(10) to fire.提出现象

　　The explanation is that each aspen,

　　while appearing to exist separately as

　　a single tree, is in fact only the stem or

　　shoot of a far larger organism. A group

　　(15) of thousands of aspens can actually

　　constitute a single organism, called a

　　clone, that shares an interconnected root

　　system and a unique set of genes. Thus,

　　when one aspen—a single stem—dies,

　　(20) the entire clone is affected. While alive,

　　a stem sends hormones into the root

　　system to suppress formation of further

　　stems. But when the stem dies, its

　　hormone signal also ceases. If a clone

　　(25) loses many stems simultaneously, the

　　resulting hormonal imbalance triggers a

　　huge increase in new, rapidly growing

　　shoots that can outnumber the ones

　　destroyed. An aspen grove needs to

　　(30) experience fire or some other disturbance

　　regularly, or it will fail to regenerate and

　　spread. Instead, coniferous trees will

　　invade the aspen grove’s borders and

　　increasingly block out sunlight needed by

　　the aspens. 解释现象

　　现象解释

　　逻辑简图：

　　1P: fires promote the survival of aspen trees. Needs for fire may seems illogical….

　　2P: the explanation is that… thus…

　　以上就是本期GMAT试题的所有内容，考生可以此为据并进行针对性的练习，逐步掌握GMAT阅读的解题规律及技巧，以达到迅速提高GMAT考试成绩的目的。 相关链接：

1.GMAT考试资料：GWD试题合集（八）

2.GMAT考试资料：GWD试题合集（七）

3.GMAT考试资料：GWD试题合集（六）

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