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sharonyyyy · 发表于 2011-8-31 18:16:47

A popular beach has long had a dolphin feeding program in which fish are given to dolphins several times a day; many dolphins get as much as half of their food each day there. Although dolphins that first benefit from the program as adults are healthy and long-lived, their offspring have a lower life expectancy than offspring of dolphins that feed exclusively in the wild.

Which of the following, if true, most helps to explain the lower life expectancy of offspring of dolphins feeding at the beach compared to other young dolphins?

(A) Sharks that prey on dolphins are less common in the open seas off the beach than in many other areas of the open seas where dolphins congregate(聚集).

(B) Many of the adult dolphins that feed at the beach are females that nurse their offspring there.

(C) The fish given to the dolphins at the beach are the same types of fish that dolphins typically catch in the wild.

(D) Many dolphins that feed at the beach with their offspring come to the beach only a few times a month.

(E) Adult dolphins that feed at the beach spend much less time teaching their offspring how to catch fish in the wild than do other adult dolphins.

請問這道題爲什麽選E? 那些dolphin少了捕魚的能力就會使它平均壽命減少嗎? 這裡沒有說它要去競爭吃的丫~~求解..

alex168 · 发表于 2011-8-31 23:04:27

sharonyyyy · 发表于 2011-8-31 23:11:31

E?

-- by 会员 alex168 (2011/8/31 23:04:27)

是的

one1day · 发表于 2011-8-31 23:22:59

Which of the following, if true, most helps to explain the lower life expectancy of offspring of dolphins feeding at the beach compared to other young dolphins?

原题的逻辑是，被喂食的成年海豚。。。，其后代平均寿命比不被喂食的海豚后代短。

问why？

(A) Sharks that prey on dolphins are less common in the open seas off the beach than in many other areas of the open seas where dolphins congregate(聚集).【捕食者sharks的狩猎范围，无关，原文没提两种不同幼崽的分布范围】

(B) Many of the adult dolphins that feed at the beach are females that nurse their offspring there.【在哪里吃饭就在哪哺育后代，so？so啥啊，跟没说一样】

(C) The fish given to the dolphins at the beach are the same types of fish that dolphins typically catch in the wild.【伙食水平均衡，so？无关】

(D) Many dolphins that feed at the beach with their offspring come to the beach only a few times a month.【只说了被喂食的成年+后代，没提对比组的情况】

(E) Adult dolphins that feed at the beach spend much less time teaching their offspring how to catch fish in the wild than do other adult dolphins.
【两组两代对比，完胜！这就是所谓的标准答案！！】

sharonyyyy · 发表于 2011-9-3 17:00:19

Which of the following, if true, most helps to explain the lower life expectancy of offspring of dolphins feeding at the beach compared to other young dolphins?

原题的逻辑是，被喂食的成年海豚。。。，其后代平均寿命比不被喂食的海豚后代短。

问why？

(A) Sharks that prey on dolphins are less common in the open seas off the beach than in many other areas of the open seas where dolphins congregate(聚集).【捕食者sharks的狩猎范围，无关，原文没提两种不同幼崽的分布范围】

(B) Many of the adult dolphins that feed at the beach are females that nurse their offspring there.【在哪里吃饭就在哪哺育后代，so？so啥啊，跟没说一样】

(C) The fish given to the dolphins at the beach are the same types of fish that dolphins typically catch in the wild.【伙食水平均衡，so？无关】

(D) Many dolphins that feed at the beach with their offspring come to the beach only a few times a month.【只说了被喂食的成年+后代，没提对比组的情况】

(E) Adult dolphins that feed at the beach spend much less time teaching their offspring how to catch fish in the wild than do other adult dolphins.
【两组两代对比，完胜！这就是所谓的标准答案！！】

-- by 会员 one1day (2011/8/31 23:22:59)

可是E对比了也无关吧...不会捕鱼跟平均寿命有关系吗?不用捕鱼也有人喂养啊..

本贴相关题目 GMATPrep-2007E1-CR-4 (CGDM)

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