GMAT申友阅读RC题库-It can be inferred from the passage that when aspen groves experience a “disturbance” (line 30), such a disturbance-GWD

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Even more than mountainside slides of mud or snow, naturally occurring forest fires promote the survival of aspen trees.

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.

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 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, 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.

It can be inferred from the passage that when aspen

groves experience a “disturbance” (line 30), such a disturbance

A. leads to a hormonal imbalance within an aspen clone

B. provides soil conditions that are favorable for new shoots

C. thins out aspen groves that have become overly dense

D. suppresses the formation of too many new aspen stems

E. protects aspen groves by primarily destroying coniferous trees rather than aspens

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答案：

定位到“

disturbance” ，后面一句开头是Instead 说明应该不是在讲一件事，所以往前找直到BUT，然后定位 If a clone loses many stems simultaneously, the resulting hormonal imbalance triggers a huge increase in new, rapidly growing shoots that can outnumber the ones destroyed. 跟生长有关系，BCE无关，D与原文相反，选A