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题库 / Prep2007E1-CR-4
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?
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.
Many of the adult dolphins that feed at the beach are females that nurse their offspring there.
The fish given to the dolphins at the beach are the same types of fish that dolphins typically catch in the wild.
Many dolphins that feed at the beach with their offspring come to the beach only a few times a month.
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.
A.捕食海豚的鲨鱼主要在哪出没（没有提到项目和海豚宝宝，无关）B 许多受益于项目的海豚是哺育宝宝的海豚妈妈（推不出宝宝为何脆弱，无关）C 投食的鱼和海豚在海里捕食的鱼是一样一样的（证明成年鱼的相似性，与推理无关）D 许多在沙滩吃食的海豚和他们的宝宝们一个月只来几次（推不出宝宝为何脆弱，无关）E 在沙滩吃食的成年海豚比其它成年海豚更少时间教他们的宝宝如何在野外捕鱼（正确，因为项目占用了爸妈的时间，导致海豚宝宝野外捕鱼奇数差，所以很快就饿死了。）
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