GRE·94-10考题—（7）
文章作者 100test 发表时间 2007:02:25 20:09:53
来源 100Test.Com百考试题网
In lines 19-21, the phrase "the trees"
defensive mechanism has an impact on moth
fecundity" refers to which of the following
phenomena?
Female moths that ingest phenols are
more susceptible to wilt virus, which
causes them to lay smaller eggs.
Highly concentrated phenols in tree
leaves limit caterpillars food supply,
thereby reducing the gypsy moth popu-
lation.
Phenols attack the protein globule
that protects moth egg clusters, making
them vulnerable to wilt virus and
lowering their survival rate.
Phenols in oak leaves drive gypsy moths
into forest stands dominated by aspens,
where they succumb to viral epidemics.
The consumption of phenols by cater-
pillars results in undersized female
gypsy moths, which tend to produce
small egg clusters.
————————————————————————
答案：(E)
在美国的东北部地区，上百万亩的树木由于舞毒蛾毛虫大规模的侵扰而导致的掉叶
现�
下一页：阅读《GRE·94-10考题—（7）》的全文
|
