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  3. THE DOMESTICATION OF ANIMALS 1 The domestication of wild species led directly to denser human populations by yielding more foo

THE DOMESTICATION OF ANIMALS 1 The domestication of wild species led directly to denser human populations by yielding more foo

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问题               THE DOMESTICATION OF ANIMALS
1   The domestication of wild species led directly to denser human populations by yielding more food than the hunter-gatherer lifestyle could provide. In societies that possessed domestic animals, livestock helped to feed more people by providing meat, milk, and fertilizer, and by pulling plows. Large domestic animals became the societies’ main source of animal protein, replacing wild game, and they also furnished wool, leather, and land transport. Humans have domesticated only a few species of large animals, with "large" defined as those weighing over 100 pounds (45 kilograms). Fourteen such species were domesticated before the twentieth century, all of them terrestrial mammals and herbivores. The five most important of these are sheep, goats, pigs, horses, and cattle or oxen.
2   Small animals such as ducks, geese, rabbits, dogs, cats, mink, bees, and silkworms have also been domesticated. Many of these small animals provided food, clothing, or warmth. However, none of them pulled plows or wagons, none carried riders, and none except dogs pulled sleds. Furthermore, no small domestic animals have been as important for food as have large domestic animals.
3   Early herding societies quickly domesticated all large mammal species that were suitable for domestication. There is archaeological evidence that these species were domesticated between 10,000 and 4,500 years ago, within the first few thousand years of the origins of farming-herding societies after the last Ice Age. The continent of Eurasia has been the primary site of large mammal domestication. Having the most species of wild mammals to begin with, and losing the fewest to extinction in the last 40,000 years, Eurasia has generated the most candidates for domestication.
4   Domestication involves transforming wild animals into something more useful to humans. Truly domesticated animals differ in many ways from their wild ancestors. These differences result from two processes: human selection of individual animals that are more useful to humans than other individuals of the same species, and evolutionary responses of animals to the forces of natural selection operating in human environments rather than in wild environments.
5   To be domesticated, a wild species must possess several characteristics. A candidate for domestication must be primarily a herbivore because it takes less plant biomass to feed a plant eater than it does to feed a carnivore that consumes plant eaters. No carnivorous mammal has ever been domesticated for food simply because it would be too costly. A candidate must not only weigh an average of over 100 pounds but also grow quickly. That eliminates gorillas and elephants, even though they are herbivores. Moreover, candidates for domestication must be able to breed successfully in captivity.
6   Since almost any sufficiently large mammal species is capable of killing a human, certain qualities disqualify a wild animal for domestication. The animal cannot have a disposition that is nasty, dangerous, or unpredictable—characteristics that eliminate bears, African buffaloes, and some species of wild horses. The animal cannot be so nervous that it panics around humans. Large herbivorous mammal species react to danger from predators or humans in different ways. Some species are nervous, fast, and programmed for instant flight when they perceive danger. Others are less nervous, seek protection in herds, and do not run until necessary. Most species of deer and antelope are of the former type, while sheep and goats are of the latter.
7   Almost all domesticated large mammals are species whose wild ancestors share three social characteristics: living in a herd, maintaining a dominance hierarchy in the herd, and having herds that occupy overlapping home ranges instead of mutually exclusive territories. Humans have taken advantage of these characteristics in keeping domestic animals together with others of their species and in close proximity to other species of domestic animals.
   Glossary:
   terrestrial: living on land rather than in water
   herbivores: animals that feed mainly on plants
Read the first sentence of a summary of the passage. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points.   The domestication of animals provided humans with food, clothing, and other benefits.   
______   
______   
______   
Answer Choices
A. The most important domestic animals are large herbivorous mammals that live in herds.   
B. Ducks, geese, rabbits, dogs, cats, and many other small animals have been domesticated.   
C. Although herbivores eat mainly plant matter, some species occasionally eat small animals.   
D. Humans quickly domesticated all large mammal species that were suitable for domestication.   
E. Animals must have several essential characteristics in order to be domesticated successfully.
F. Large herbivorous mammals respond in various ways when threatened by predators.
选项
答案ADE
解析 Key information: Large domestic animals became the societies’main source of animal protein..., Early herding societies quickly domesticated all large mammal species that were suitable for domestication; To be domesticated, a wild species" must possess several characteristics. A candidate for domestication must be primarily a herbivore...; Almost all domesticated large mammals are species whose wild ancestors share three social characteristics." living in a herd.... Answers (B) and (F) are minor ideas; answer (C) is not mentioned. (1.9)
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