tania的考试复习计划贴：谢谢大家的帮助和支持！！M51,V41,760!

tania

gwd-9-6

虽然做题时我选了c，但认真看后我觉得这道题还是应该选d

因为原文中并没有把这一点作为两者的不同，而是提到“在这种资源分布不均匀的情况下，高地的人需要获得lower, warmer climatic zones的产品”然后作者提到一种方式是 preindustrial world的，在这种方式下，最终消费者exercise little control，说明产品有限，所以高地的人更多的采取了另一种方式，也就是vertical economy，暗示了这种方式可以解决上面的问题，也就是greater access to commodities from lower, warmer climatic zones

[此贴子已经被作者于2005-9-5 12:32:04编辑过]

tania

汇报今日战况：

gwd-13   v  5个  其中rc 2个   cr  2个     sc 1个

         m  5个（其中ds 4个   为什么总是这样，我真的觉得做的时候很认真了，可看到答案  

                   时。。。。。）

分析了一下数学的原因，还是做题时尤其是ds时没有形成良好的思维习惯，不管题目难易，一定要养成先看条件1，在单独看条件2，如果都不行，再把两个条件加到一起看，还不行得话，就是e了。

AegeanSea2006

以下是引用tania在2005-9-5 13:59:00的发言：

分析了一下数学的原因，还是做题时尤其是ds时没有形成良好的思维习惯，不管题目难易，一定要养成先看条件1，在单独看条件2，如果都不行，再把两个条件加到一起看，还不行得话，就是e了。

非常同意，我也犯同样的错误，jj的v好让人羡慕...，多注意身体哦

tania

谢谢AegeanSea!只有两周了，坚持到底！！

ethyl

55。。开学了！～～

忙得一塌糊涂的。。taniaJJ继续加油啊。。知道你的进度很好，模考也很好。。。真高兴！

我抽时间还是回来的，hoho~

tania

谢谢ethyl，我会加油的，争取不辜负大家的期望和帮助！！

liu977

一天一贴支持ing。。。

esprit

以下是引用ethyl在2005-9-5 18:27:00的发言：

55。。开学了！～～

忙得一塌糊涂的。。taniaJJ继续加油啊。。知道你的进度很好，模考也很好。。。真高兴！

我抽时间还是回来的，hoho~

[em

我也很奇怪啊

开学多好啊

wwwhahchn

GWD-13-34不懂，特来请教

Q34 to Q37:

      A small number of the forest

       species of lepidoptera (moths and

       butterflies, which exist as caterpillars

Line       during most of their life cycle) exhibit

  (5)      regularly recurring patterns of popu-

lation growth and decline—such

fluctuations in population are known

as population cycles.  Although many

different variables influence popula-

(10)      tion levels, a regular pattern such as

a population cycle seems to imply a

dominant, driving force.  Identification

of that driving force, however, has

proved surprisingly elusive despite

(15)      considerable research.  The com-

mon approach of studying causes of

population cycles by measuring the

mortality caused by different agents,

such as predatory birds or parasites,

(20)      has been unproductive in the case of

       lepidoptera.  Moreover, population

       ecologists’ attempts to alter cycles

by changing the caterpillars’ habitat

and by reducing caterpillar popula-

(25)      tions have not succeeded.  In short,

the evidence implies that these insect

populations, if not self-regulating, may

at least be regulated by an agent more

intimately connected with the insect than

(30)      are predatory birds or parasites.

      Recent work suggests that this

agent may be a virus.  For many

       years, viral disease had been

reported in declining populations

(35)    of caterpillars, but population ecolo-

gists had usually considered viral

disease to have contributed to the

decline once it was underway rather

than to have initiated it.  The recent

(40)     work has been made possible by

new techniques of molecular biology

that allow viral DNA to be detected

at low concentrations in the environ-

ment.  Nuclear polyhedrosis viruses

(45)      are hypothesized to be the driving

force behind population cycles in

lepidoptera in part because the

viruses themselves follow an infec-

tious cycle in which, if protected from

(50)      direct sun light, they may remain

virulent for many years in the envi-

ronment, embedded in durable

crystals of polyhedrin protein.

Once ingested by a caterpillar,

(55)      the crystals dissolve, releasing

the virus to infect the insect’s cells.

Late in the course of the infection,

millions of new virus particles are

formed and enclosed in polyhedrin

(60)      crystals.  These crystals reenter the

environment after the insect dies and

decomposes, thus becoming avail-

able to infect other caterpillars.

      One of the attractions of this

(65)      hypothesis is its broad applicability.

Remarkably, despite significant differ-

ences in habitat and behavior, many

species of lepidoptera have population

cycles of similar length, between eight

(70)      and eleven years.  Nuclear polyhe-

drosis viral infection is one factor these

disparate species share.

--------------------------------------------------------------------------------

Q34:

Which of the following, if true, would most weaken the author’s conclusion in lines 25-30?

              

1. New research reveals that the number of species of birds and parasites that prey on lepidoptera has dropped significantly in recent years.


2. New experiments in which the habitats of lepidoptera are altered in previously untried ways result in the shortening of lepidoptera population cycles.


3. Recent experiments have revealed that the nuclear polyhedrosis virus is present in a number of predators and parasites of lepidoptera.


4. Differences among the habitats of lepidoptera species make it difficult to assess the effects of weather on lepidoptera population cycles.


5. Viral disease is typically observed in a large proportion of the lepidoptera population.

答案B，我选了C

tania

以下是引用wwwhahchn在2005-9-5 20:30:00的发言：

GWD-13-34不懂，特来请教

Q34 to Q37:

      A small number of the forest

       species of lepidoptera (moths and

       butterflies, which exist as caterpillars

Line       during most of their life cycle) exhibit

  (5)      regularly recurring patterns of popu-

lation growth and decline—such

fluctuations in population are known

as population cycles.  Although many

different variables influence popula-

(10)      tion levels, a regular pattern such as

a population cycle seems to imply a

dominant, driving force.  Identification

of that driving force, however, has

proved surprisingly elusive despite

(15)      considerable research.  The com-

mon approach of studying causes of

population cycles by measuring the

mortality caused by different agents,

such as predatory birds or parasites,

(20)      has been unproductive in the case of

       lepidoptera.  Moreover, population

       ecologists’ attempts to alter cycles

by changing the caterpillars’ habitat

and by reducing caterpillar popula-

(25)      tions have not succeeded.  In short,

the evidence implies that these insect

populations, if not self-regulating, may

at least be regulated by an agent more

intimately connected with the insect than

(30)      are predatory birds or parasites.

      Q34:

Which of the following, if true, would most weaken the author’s conclusion in lines 25-30?

              

1. New research reveals that the number of species of birds and parasites that prey on lepidoptera has dropped significantly in recent years.


2. New experiments in which the habitats of lepidoptera are altered in previously untried ways result in the shortening of lepidoptera population cycles.


3. Recent experiments have revealed that the nuclear polyhedrosis virus is present in a number of predators and parasites of lepidoptera.


4. Differences among the habitats of lepidoptera species make it difficult to assess the effects of weather on lepidoptera population cycles.


5. Viral disease is typically observed in a large proportion of the lepidoptera population.

答案B，我选了C

标记黄色的部分与这道题有关。in short之前的部分是作者得出这个结论的理由：The com

mon approach has been unproductive in the case of  lepidoptera.  Moreover, population ecologists’ attempts to alter cycles have not succeeded. 根据这两条理由，作者得出结论如下：这些昆虫的多少与他们的捕食者关系不大。

B选项通过说明用以前没有试过的方法进行新的实验，改变了L的cycle，从而推翻了第二条理由，削弱了作者的结论。

C选项之所以不对是因为它里面提到的np是后文出现的内容，是解释L的另一种方法中出现的名词，与这里的推理无关。

open to discuss........