天山-4-13

fatlara

以下是引用vacationer在2005-9-11 10:38:00的发言：

Which of the following, if true, most seriously weakens the argument?

A.   er unit of volume, the natural insecticide produced by the genetically modified maize plants is less toxic to insects than are many commercial insecticides commonly used on maize plants.

B.    Standard weed-control practices that have been used by farmers for decades have largely eliminated milkweed plants from certain areas where monarch-butterfly caterpillars were once common.

C.   The experiments showed that the caterpillars were not harmed by contact with the pollen from the genetically modified plants unless they ingested it.

D.   The maize-eating insects that the natural insecticide protects against do not feed on the pollen of the maize plant.

E.    Airborne maize pollen tends to collect on the middle leaves of milkweed plants and monarch caterpillars feed only on the plant’s tender upper leaves.

为什么我下载的问题跟大家不一样?

这个题目好像GWD里面也有的

问的就是WEAKEN,可是想不起来是哪一套里面的了~~~汗~~

等俺找着了, 贴出来好了~~

fatlara

以下是引用vancouverade在2005-9-23 0:16:00的发言：
E项中就算有虫子同他竞争，也同样会对它带来危险啊，只是程度大小而已

偶为什么当时就选了E了涅~~~

philipsnf

因为竞争并不能表示吃得少，而不主动去吃却可以表示，所以从程度上来讲，C更强一些

Febby1984

E不对啊~否定回答,也就是没有虫子和它们竞争,它们有可能吃了叶子就死,方向不定;肯定回答,有虫子竞争,CATERPILLAR会因为竞争而受到威胁,HOHO,SUPPORT

ycgxx

这是两个版本的，一题是weaken， 一题是evaluation。。。原文一样，但是题目不一样啊。

版本一：

Certain genetically modified strains of maize produce a natural insecticide that protects against maize-eating insects.  The insecticide occurs throughout the plant, including its pollen.  Maize pollen is dispersed by the wind and often blows onto milkweed plants that grow near maize fields.  Caterpillars of monarch butterflies feed exclusively on milkweed leaves.  When, in experiments, these caterpillars were fed milkweed leaves dusted with pollen from modified maize plants, they died.  Therefore, use of the modified maize inadvertently imperils monarch butterflies.

 

Which of the following, if true, most seriously weakens the argument? （E)

 

1. Per unit of volume, the natural insecticide produced by the genetically modified maize plants is less toxic to insects than are many commercial insecticides commonly used on maize plants.

2. Standard weed-control practices that have been used by farmers for decades have largely eliminated milkweed plants from certain areas where monarch-butterfly caterpillars were once common.

3. The experiments showed that the caterpillars were not harmed by contact with the pollen from the genetically modified plants unless they ingested it.

4. The maize-eating insects that the natural insecticide protects against do not feed on the pollen of the maize plant.

5. Airborne maize pollen tends to collect on the middle leaves of milkweed plants and monarch caterpillars feed only on the plant’s tender upper leaves.

版本二：(C)

Which of the following would it be most useful to determine in order to evaluate the argument?

A. Whether the natural insecticide is as effective against maize-eating insects as commercial insecticides typically used on maize are

B. Whether the pollen of genetically modified maize contains as much insecticide as other parts of these plants

C. Whether monarch butterfly caterpillars are actively feeding during the part of the growing season when maize is releasing pollen
D. Whether insects that feed on genetically modified maize plants are likely to be killed by insecticide from the plant’s pollen
E. Whether any maize-eating insects compete with monarch caterpillars for the leaves of milkweed plants growing near maize fields

A. Whether the natural insecticide is as effective against maize-eating insects as commercial insecticides typically used on maize are

B. Whether the pollen of genetically modified maize contains as much insecticide as other parts of these plants

C. Whether monarch butterfly caterpillars are actively feeding during the part of the growing season when maize is releasing pollen
D. Whether insects that feed on genetically modified maize plants are likely to be killed by insecticide from the plant’s pollen
E. Whether any maize-eating insects compete with monarch caterpillars for the leaves of milkweed plants growing near maize fields