[求助]最新的GWD28－1阅读

wangyu73cn

Social learning in animals is said to occur when direct or indirect social interaction

facilitates the acquisition of a novel behavior. 
社会属性习得，社会接触获得新行为。

It usually takes the form of an 

experienced animal (the demonstrator) performing a behavior such that the naïve 

animal (the observer) subsequently expresses the same behavior sooner, or more 

completely, than it would have otherwise. 
青出于蓝。

One example of social learning is the acquisition

 of preferences for novel foods. 
一个例子是获取新食物

Some experiments have suggested that among mammals, 

social learning facilitates the identification of beneficial food items, but that among birds, 

social learning helps animals avoid toxic substances. 
试验表明哺乳动物习得偏好食物，而鸟类习得避开有毒物。

For example, one study showed 

that when red-wing blackbirds observed others consuming a colored food (30) or a 

food in a distinctly marked container and then becoming ill, they subsequently avoided 

food associated with that color (35) or container. 
其他鸟避开了使得以前的鸟生病的某类特征食物

Another experiment showed that house 

sparrows consumed less red food after they observed others eating (40) red food that was 

treated so as to be noxious. 
又一例。

 Studies on non-avian species have not produced similar results, 

leading researchers to speculate that avian social learning may be fundamentally different from 

that of mammals.
而哺乳动物则不能躲避有毒食物。

But Sherwin's recent (50) experiments with domestic hens do not support the 

notion that avian social learning necessarily facilitates aversion to novel (55) foods that are noxious or toxic. 
但新研究表明家养母不支持上述鸟类的社会习得行为。

Even when demonstrator hens reacted with obvious disgust to a specific food, via 

vigorous head (60) shaking and bill wiping, there was no evidence that observers subsequently 

avoided eating that food. 
具体情况。

Sherwin's research team speculated that ecological or social constraints 

during the evolution of this species might have resulted in there being little benefit from the social

learning of atability, for instance, selective pressures for this mode of learning would be reduced

 if the birds rarely encountered noxious or toxic food or rarely interacted after eating such food, 

or if the consequences of ingestion were minimal. 
推测有些进化过程中的因素起作用。

(80) In a related experiment the same researchers 

showed that if observer hens watched demonstrator hens react favorably to food of a particular color, then observer hens ate more food of that color than they ate of food of other colors. 
类似于哺乳动物的习得行为。

These results confirmed that avian species can develop preferences for 

palatable food through social learning.

结果确认其偏好食物的习得行为。

28-3: The primary purpose of the passage is to discuss the

A: techniques used in certain experiments on social learning in birds          细节

B: reasons for the differences between social learning in birds and in mammals            无或细节

C: question of how social learning manifests itself in birds            非重点

D: basis for a widespread belief about a difference in behavior between birds and mammals。不仅仅指出其理论基础，还有反例来反驳该说法。

E: possible reasons why birds may or may not learn from each other in a particular way 有此内容

28-4: missing

28-5: According to the passage, which of the following is true of the experiments on domestic hens conducted by Sherwin’s research team?

A: Only a small number of observer hens appeared to learn to avoid food that was demonstrated by other hens to be noxious. 无

B: Observer hens ingested food preferentially only after numerous instances of witnessing demonstrator hens preferentially ingest that type of food. 无

C: Observer hens appeared unable to recognize when demonstrator hens found a particular food especially palatable. 反

D: Observer hens appeared unable to recognize when demonstrator hens found a particular food especially palatable.

E: Demonstrator hens altered their behavior less obviously in response to noxious foods than in response to highly palatable foods. 正确。

28-6: It can be inferred that the author of the passage would be most likely to agree with which of the following statements regarding the results of the recent experiments conducted by Sherwin’s research team?

A: The experiments demonstrate that social learning in avian species facilitates the identification of noxious or toxic foods.作者指出了反例

B: The experiments suggest that social learning has made avian species less adept than nonavian species at learning to prefer beneficial foods and avoid noxious and toxic foods.作者没有此意

C: The experiments undermine the notion that most avian species have evolved in environments where there is little benefit to the social learning of unpalatability.无此意。

D: The experiments suggest that the acquisition of food preferences in avian species is largely unaffected by social learning.无

E: The experiments show that social learning in avian species can promote the preferential consumption of beneficial foods but do not support the claim that social learning in avian species promotes the avoidance of noxious or toxic foods.同意。

我是选EEE

[此贴子已经被作者于2005-7-16 23:08:08编辑过]

wangyu73cn

28-3: The primary purpose of the passage is to discuss the

A: techniques used in certain experiments on social learning in birds          细节

B: reasons for the differences between social learning in birds and in mammals            无或细节

C: question of how social learning manifests itself in birds            非重点

D: basis for a widespread belief about a difference in behavior between birds and mammals。不仅仅指出其理论基础，还有反例来反驳该说法。

E: possible reasons why birds may or may not learn from each other in a particular way 有此内容

此题我虽然最终选择E。但有几点考虑使我不能确认D是否更好些，在此说明一下供大家参考：1、basis for a widespread belief 里的basis也应可以包括对belief正反两种态度的内容。也基本可接受。2、a difference in behavior between birds and mammals只是说这是a widespread belief 的内容，并不代表此选项就认为birds and mammals之间存在不同。3、E选项中的possible reasons有点倾向于具体内容了，不太宏观。