2022英语专业八级改错练习题 (34)

2022-03-01 16:31:00来源:网络

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  【练习】

  Dinosaurs, saber-tooth tigers and the dodo bird are famous examples __1

  of animals that have become extinct. In case of the dinosaurs, it __2

  seems likely that a catastrophic event alters the global climate __3

  enough to lead to their disappearance. More recent extinctions and near-extinctions-such as the blue whales, tiger, panda, and __4

  North American bison—have been the direct result of human activity. By the early 1990s, species were becoming extinct at a rate of three per hour, or 27,000 every day – a figure quoted by the American biologist Edward O.Wilson of Harvard University, based on his most conservative estimates. This rate of extinctions carries with it some terrible consequences. Each plant that becomes extinct,for example, may take with it as much as 30 insects and animals __5

  that depend on it for food. Habitat loss is one of the most important causes of extinction. For rising populations in many countries __6

  lead to the clearing of more land, habitats such as raining forest __7

  and grasslands disappear.

  In the East Africa, once renowned for its wildlife, few wild animals __8

  remain living outside the boundaries of national parks and game __9

  reserves. In other parts of the world, coastal ecosystems are clearing __10

  for development. Wetland areas are drying out as a result of water extraction to support farming and tourism. Bird species are among the worst affected by the loss of wetlands.

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