GWD 5-37疑问

hhl3000

gwd 35-37

Q35 to Q37:

      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.

      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.

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

答案A，我怎么觉得应该是D 请问Ｄ怎么排除？？？

tigerzheng

文中说ＡＳＰＥＮ的树皮不是为了比较它与其他树的外观,   

wangyu73cn

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.

1、 本句中，提及“the bark of most trees”是为了强调“aspens are particularly vulnerable to fires”，即答案A的意思。

2、D选项“difference in appearance”，外观的不同，没有提及。而且，也不是这里作比较的目的。

3、本题的能够归纳的特点在于：一、两个分句由分号连接，后句解释前句，后句内容的目的在于解释或强调前句的内容。二，作比较的说明方式是有其目的性的。