GWD 5-37

powerful

以下是引用neverback在2004-12-17 15:00:00的发言：

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
                    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
                    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 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 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.(35)

Q37:The author of the passage refers to “the bark of most trees” (line 6) most likely in order to emphasize the

1. vulnerability of aspens to damage from fire when compared to other trees

2. rapidity with which trees other than aspens succumb to destruction by fire

3. relatively great degree of difficulty with which aspens catch on fire when compared to other trees

4. difference in appearance between the bark of aspens and that of other trees

5. benefits of fire to the survival of various types of trees

MINE C

ANS A

请指教

关键理解succumbs这个词， 屈服, 屈从, 的意思

icindy

为什么C不对呢？

孙维容

omg I chose B...

取巧

第36题D为什么是错的？错在new吗？

SAGA5

见下面

SAGA5

GWD5-Q36:
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

E是迷惑选项。诱导你定位错误。首先就要定位到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足够选A

如果不放心，E也是错的，disturbance确实protect了ASPEN，但是不是以 by primarily destroying coniferous trees rather than aspens的方式。因为火等其他Disturbance不仅destroy毁了树也同样烧毁了ASPEN，只是烧毁对SAPEN是有好处的，因为如A所述。

小伊YSY

up!

小伊YSY

up

enjoygmat2013

试着解释36题。我一开始选了D，怎么也想不明白为什么A对，后来发现是自己想反了。嗯，首先要明确Aspen的生长目标是regenerate和spread，但是呢， 这种树的stem会给root传递荷尔蒙让他不许长得太多太快。那么怎么办呢，就一把火烧掉一些stem，让他没法向root传递这种信号，root就能长得多多多的，远远比烧掉地那些多，所以牺牲小我，换来大我，何乐而不为捏。所以这种以fire为代表的disturbance 就是造成了这样一种可以不遏制植物生长的imbalance。这里的imbalance没有贬义啦，就是和以前那种在压抑节制中的生长相反而已。

Amy洛洛

enjoygmat2013 发表于 2013-10-6 11:50
试着解释36题。我一开始选了D，怎么也想不明白为什么A对，后来发现是自己想反了。嗯，首先要明确Aspen的生 ...

同意！