Prep Test2- essay11

[kaijen]

Test2- Essay #11. 316 (22921-!-item-!-188;#058&00316-00)

Most farmers attempting to control slugs and snails turn to baited slug poison, or molluscicide, which usually consists of a bran pellet containing either methiocarb or metaldehyde. Both chemicals are neurotoxins that disrupt that part of the brain charged with making the mouth move in a coordinated fashion--the "central pattern generator"--as the slug feeds. Thus, both neurotoxins, while somewhat effective, interfere with the slugs' feeding behavior and limit their ingestion of the poison, increasing the probability that some will stop feeding before receiving a lethal dose. Moreover, slugs are not the only consumers of these poisons: methiocarb may be toxic to a variety of species, including varieties of worms, carabid beetles, and fish.

Researchers are experimenting with an alternative compound based on aluminum, which may solve these problems, but this may well have a limited future as we learn more about the hazards of aluminum in the environment. For example, some researchers suggest that acid rain kills trees by mobilizing aluminum in the soil, while others have noted that the human disease Alzheimer's is more prevalent in areas where levels of aluminum in the soil are high. With farmers losing as much as 20 percent of their crops to slugs and snails even after treatment with currently available molluscicides, there is considerable incentive for researchers to come up with better and environmentally safer solutions.

Question #36. 316-01 (22967-!-item-!-188;#058&000316-01)

In the passage, the author is primarily concerned with

(A) describing the limitations of molluscicides that affect feeding behavior
(B) proposing alternatives to current methods of controlling slugs and snails
(C) emphasizing the need for an alternative to currently available molluscicides
(D) explaining how molluscicides are used to control slugs and snails
(E) criticizing the use of hazardous material for controlling slugs and snails

Ans:(C)

Question #37. 316-04 (23013-!-item-!-188;#058&000316-04)

The author cites which of the following as a disadvantage of methiocarb?

(A) It contains high levels of aluminum.
(B) It may react with acid rain to kill trees.
(C) It has been associated with Alzheimer's disease.
(D) It may be toxic to some species of fish.
(E) It may not be as effective in killing slugs as metaldehyde is.

Ans:(D)

Question #38. 316-06 (23059-!-item-!-188;#058&000316-06)

The passage suggests that methiocarb and metaldehyde would be more effective as slug poisons if it were true that they

(A) disrupt the slug's digestive processes rather than its reproductive functions
(B) reduce the slug's ability to taste food
(C) begin to affect the feeding behavior of a slug only after it has ingested a lethal dose
(D) reach the central pattern generator more quickly
(E) accumulate only in the central pattern generator rather than throughout the brain

Ans:(C)

[kaijen]

Question #36. 316-01 (22967-!-item-!-188;#058&000316-01)

In the passage, the author is primarily concerned with

(A) describing the limitations of molluscicides that affect feeding behavior
(B) proposing alternatives to current methods of controlling slugs and snails
(C) emphasizing the need for an alternative to currently available molluscicides
(D) explaining how molluscicides are used to control slugs and snails
(E) criticizing the use of hazardous material for controlling slugs and snails

Ans:(C)

這一題(B)(C)要如何分辨呢?

[dibert8]

文章流程:
方法1/缺點 --> 方法2/缺點 --> 都沒解決問題,需要其它更好的方法

(B) too specific: 第二段提到一個 alternative, 但是不好,被作者否決了.

[foric0822]

本文章在最後一句主旨句是作者提出的
所以應該要以主旨句為主，來選擇答案

[chris8888]

段落首句 : 農夫要去控制slugs and snails, 求助於毒物.
Most farmers attempting to control slugs and snails turn to baited slug poison, or molluscicide, which usually consists of a bran pellet containing either methiocarb or metaldehyde. Both chemicals are neurotoxins that disrupt that part of the brain charged with making the mouth move in a coordinated fashion--the "central pattern generator"--as the slug feeds. Thus, both neurotoxins, while somewhat effective, interfere with the slugs' feeding behavior and limit their ingestion of the poison, increasing the probability that some will stop feeding before receiving a lethal dose. Moreover, slugs are not the only consumers of these poisons: methiocarb may be toxic to a variety of species, including varieties of worms, carabid beetles, and fish.
段落末句 : 此毒物卻會被其他物種吃下去, 有缺點

可以用鋁, 不過又對環境有傷害
Researchers are experimenting with an alternative compound based on aluminum, which may solve these problems, but this may well have a limited future as we learn more about the hazards of aluminum in the environment. For example, some researchers suggest that acid rain kills trees by mobilizing aluminum in the soil, while others have noted that the human disease Alzheimer's is more prevalent in areas where levels of aluminum in the soil are high. With farmers losing as much as 20 percent of their crops to slugs and snails even after treatment with currently available molluscicides, there is considerable incentive for researchers to come up with better and environmentally safer solutions.
說 : 有很大的動機讓研究人員去想出在環境上更好的更安全的解決方案

Question #36. 316-01 (22967-!-item-!-188;#058&000316-01)

In the passage, the author is primarily concerned with

(A) describing the limitations of molluscicides that affect feeding behavior 描述M的限制, 這不是主旨, 細節
(B) proposing alternatives to current methods of controlling slugs and snails 提出控制slugs and snails的目前方法的選擇, 不太對, 研究人員目前找不出, 但給了很大的動機去找.
(C) emphasizing the need for an alternative to currently available molluscicides 強調對於替代方案的需求確實需要被找出
(D) explaining how molluscicides are used to control slugs and snails 不是關於M如何.
(E) criticizing the use of hazardous material for controlling slugs and snails
批評? 沒有的事

[Huang Hsin-Yi]

Test2- Essay #11. 316 (22921-!-item-!-188;#058&00316-00)

Most farmers attempting to control slugs and snails turn to baited slug poison, or molluscicide, which usually consists of a bran pellet containing either methiocarb or metaldehyde. Both chemicals are neurotoxins that disrupt that part of the brain charged with making the mouth move in a coordinated fashion--the "central pattern generator"--as the slug feeds. Thus, both neurotoxins, while somewhat effective, interfere with the slugs' feeding behavior and limit their ingestion of the poison, increasing the probability that some will stop feeding before receiving a lethal dose. Moreover, slugs are not the only consumers of these poisons: methiocarb may be toxic to a variety of species, including varieties of worms, carabid beetles, and fish.

Researchers are experimenting with an alternative compound based on aluminum, which may solve these problems, but this may well have a limited future as we learn more about the hazards of aluminum in the environment. For example, some researchers suggest that acid rain kills trees by mobilizing aluminum in the soil, while others have noted that the human disease Alzheimer's is more prevalent in areas where levels of aluminum in the soil are high. With farmers losing as much as 20 percent of their crops to slugs and snails even after treatment with currently available molluscicides, there is considerable incentive for researchers to come up with better and environmentally safer solutions.


Question #38. 316-06 (23059-!-item-!-188;#058&000316-06)

The passage suggests that methiocarb and metaldehyde would be more effective as slug poisons if it were true that they

(A) disrupt the slug's digestive processes rather than its reproductive functions
(B) reduce the slug's ability to taste food
(C) begin to affect the feeding behavior of a slug only after it has ingested a lethal dose
(D) reach the central pattern generator more quickly
(E) accumulate only in the central pattern generator rather than throughout the brain

Ans:(C)

請問c如何推出,應該是和紅色字有關,但理解不夠, 推不出來

[amazingslim]

這個毒素雖然有效，但會干擾slugs進食，限制毒藥的攝取
增加了還沒吃到毒之前就不進食的機會
所以如果如同(C)所言，吃到毒之後再影響slugs進食，就能殺死slugs了

(C) begin to affect the feeding behavior of a slug only after it has ingested a lethal dose

[Huang Hsin-Yi]

原來是這樣阿,懂了,謝謝amazingslim

[aliceberry20[origen]]

這個毒素雖然有效，但會干擾slugs進食，限制毒藥的攝取
增加了還沒吃到毒之前就不進食的機會

所以如果如同(C)所言，吃到毒之後再影響slugs進食，就能殺死slugs了



(C) begin to affect the feeding behavior of a slug only after it has ingested a lethal dose

不太懂耶
既然不再進食 slug就會自行餓死 不是也會達到一樣的效果嗎？
為何一定要吃到a lethal dose呢？