Passage 20 (20/63)-T1 T5

littledou

以下是引用xjlv128在2006-2-4 14:53:00的发言：

这题问as it is defined in the passage哎！应该定位在那个定义 expressed as the percentage of the total flowers on an individual plant that actually developed fruit and bore seeds。所以A就好啦，分母变大，分数（percentage ）当然小啦

我觉得不是说分母变大，分数变小，而是组成整个total flowers的集合中包含两部分，一部分是定义中提到的 that actually developed fruit and bore seeds，剩下的是A中提到的umpollinated flowers。如果unpollinated的比例增加，则percentage of individual plant that actually develped fruit and bore seeds相应减少。

欢迎指正。

cournot

同意11楼

xiaobaisnail

1.     Which of the following best summarizes the main point of the passage?主题题

(A) Species interdependence is a point of weakness for some plants, but is generally beneficial to insects involved in pollination.

(B) Efforts to control the spruce budworm have had deleterious effects on the red-osier dogwood.太具体了

(C) The used of pesticides may be endangering certain plant species dependent on insects for pollination.

(D) The spraying of pesticides can reduce the fecundity of a plant species, but probably does not affect its overall population stability.（C）

(E) Plant species lacking key factors in their defenses against human environmental disruption will probably become extinct.

这题我做错了选了D D为何不对呢  D分别是第二段和第三段的中心句

D选项的后半句，无法从文章中得出。而且从文章的整体结构来看，主要是讲pesticide,insect,fecundity之间的关系，C中涉及到了这三个关键词

[此贴子已经被作者于2008-1-9 15:12:52编辑过]

天蝎座1107

5.    It can be inferred that which of the following is true of plant fecundity as it is defined in the passage?

      定位要准确
            plant fecundity, expressed as the percentage of the total flowers on an individual plant that actually developed fruit and bore seeds.一定要注意后面的修饰词
            定于从句
            限定了范围
            可以最终develp fruit and bore seeds的total flowers的percentage是fecundity

(A) A plant’s fecundity decreases as the percentage of unpollinated flowers on the plant increases.如果unpollinated flowers的percentage减少那么pollinated的percentage必然减少
                那么能develop fruit和bore seeds必然减少
                那么fecundity必然减少 A

(B) A plant’s fecundity decreases as the number of flowers produced by the plant decreases.强迷惑选项

(C) A plant’s fecundity increases as the number of flowers produced by the plant increases.强迷惑选项

B和C错在都没有说明是pollinated 到这里BC都不是正确选项
                那就要再找其他定位了
                因为D和E都不是前面定位句的内容
                那么去哪里找呢？

根据D和E内容的提示The fecundity effects described here are likely to have the most profound impact on plant species with all four of the following characteristics: a short life span, a narrow geographic range, an incapacity for vegetative propagation, and a dependence on a small number of insect-pollinator species.

(D) A plant’s fecundity is usually low if the plant relies on a small number of insect species for pollination.作者只说了会是impact没有说就一定会low

最后再定位E If, on the other hand, vegetative growth and dispersal (by means of shoots or runners) are available as alternative reproductive strategies for a species, then decreases in plant fecundity may be of little consequence. （A）

(E) A plant’s fecundity is high if the plant can reproduce quickly by means of vegetative growth as well as by the production of seeds.错误 fecundity与vegetative growth无关
                是reproduce与fecundity,vegetative growth两种方法有关
                但是这两种方法没有交集的
                    

hlp1222

[微软用户1] .
            Which of the following best summarizes the main point of the passage?

(A) Species interdependence is a point of weakness for some plants, but is generally beneficial to insects involved in pollination.

(B) Efforts to control the spruce budworm have had deleterious effects on the red-osier dogwood.

(C) The used of pesticides may be endangering certain plant species dependent on insects for pollination.

(D) The spraying of pesticides can reduce the fecundity of a plant species, but probably does not affect its overall population stability.（C）

(E) Plant species lacking key factors in their defenses against human environmental disruption will probably become extinct.

---

 [微软用户1]错了两遍
                    我觉得选项C忽略了第三段的内容
                    而选项E貌似只关注了第三段的内容  

后来考虑了下，是不是因为decrease in fecundity -->decline in the overall population of a plant也是施加农药所导致的,所以才选C啊？？

sumerlaw

D的 but后面的太肯定了，定位在最后一段，文中的结论是不同的品种(分为靠种子繁殖的和靠植物方式繁殖的)，受影响不一样

难看的任

paopao 发表于 2004-4-21 12:03
结论解释型Species interdependence（ interdependencen.互相依赖）in nature confers many benefits on th ...

D选项的错误我觉得是后面的its有问题，文中的意思是物种之间会相互影响，而不是一个物种的所有数量都被影响了

DeliciaAn

顶一下14楼。做as it is defined in the passage?的题目时，一定要先回原文找到那个定义句，然后进行判断。

晓嘉听话

天蝎座1107 发表于 2009-7-26 10:14
5.    It can be inferred that which of the following is true of plant fecundity as it ...

同意！               

晓嘉听话

天蝎座1107 发表于 2009-7-26 10:14
5.    It can be inferred that which of the following is true of plant fecundity as it ...

同意！