怎么下载的答案是E啊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
答案A，我怎么觉得应该是E
注意前面一句中的particularly vulnerable to fires;通过bark tissure的对比，正是为了证明这一点。第二段根据这个很奇怪的现象作出的explanation，全篇皆以此行文。
怎么下载的答案是E啊
我选了A
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