PREP逻辑难题总结供自己复习及大家讨论（楼主勿删）

james0917

1.Parasitic wasps lay their eggs directly into the eggs of various host insects in exactly the right numbers for any suitable size of host egg.  If they laid too many eggs in a host egg, the developing wasp larvae would compete with each other to the death for nutrients and space.  If too few eggs were laid, portions of the host egg would decay, killing the wasp larvae.

Which of the following conclusions can properly be drawn from the information above?

	The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the wasp's egg-laying behavior.
	Host insects lack any effective defenses against the form of predation practiced by parasitic wasps.
	Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species.
	Failure to lay enough eggs would lead to the death of the developing wasp larvae more quickly than would laying too many eggs.
	Parasitic wasps use visual clues to calculate the size of a host egg. A

james0917

2.Automobile emissions are a significant source of air pollutants, and cars over five years old typically generate significantly greater amounts of pollutants than newer cars.  In Torinia, which has recently built its first automobile manufacturing plant, most cars are over five years old.  Aiming to boost Torinia's economy and reduce air pollution, the government plans to introduce incentives for Torinians to scrap their old cars every five years and replace them with new ones.

Which of the following, if true, most seriously undermines the likelihood that the planned incentives, if implemented, will achieve both of the cited aims?

	Without the implementation of the planned incentives, most Torinians who own an old car would be unlikely to buy a new car.
	Torinia's automobile plant manufactures car models that typically generate smaller amounts of air pollutants than most similarly sized car models manufactured elsewhere.
	The new cars produced in Torinia are not likely to be exported to other countries.
	The largest source of atmospheric pollutants in Torinia is not automobile emissions, but emissions from power plants.
	The manufacture and the scrapping of cars each generate significant amounts of air pollutants. 这道题感觉很难,DE很难区分,正确答案是E

james0917

3.On Pacific islands, a newly arrived gecko species, the house gecko, is displacing the previously established mourning gecko in urban areas, but populations of the two species are more stable in rural areas far from human settlement.The house gecko does not attack the mourning gecko, but in areas where insects congregate it prevents the mourning gecko from feeding on them.

Which of the following contributes most to an explanation of the difference between gecko populations in urban and rural areas?

	In urban areas, geckos are valued because they eat so many insects.
	Geckos defend territories against other members of the same species.
	House geckos that arrive on islands are carried there in boats and planes.
	In places where there are lighted buildings, insects tend to gather around the light.
	Mourning geckos are all females and reproduce asexually, but house geckos reproduce sexually. D

hughlv

不错的帖子。我想版主也找不到删的理由。

rainbowmanutd

额。。为什么是楼主勿删

agnesliu

第2题的D和E还是挺好区分的

题目第一句就是Automobile emissions are a significant source of air pollutants。。。只是说是污染的重要来源，跟D说最多污染来自power plant不冲突，而且D错，主要是power plant在此与题目无关，这两者谁更显著只能说明plan如果放在处理别的问题上可能效果更好，并不能说明现在的plan不能达到目标，是无关选项。

E直接表示，尽管汽车尾气减少了，处理废旧汽车的过程会造成更大的污染，那么与plan的初衷要降低污染相背离