We learn from the passage that the traditional view of slash-and-burn farming is that ________.

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• 1Most rainforest soils are thin and poor because ________.

  A.the composition of the topsoil is rather unstable

  B.black carbon is washed away by heavy rains

  C.organic matter is quickly lost due to heat and rain

  D.long-term farming has exhausted the ingredients essential to plant growth

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• 2Glaser made his discovery by ________.

  A.studying patches of fertile soils in the central Amazon

  B.examining pottery left over by ancient civilizations

  C.test-burning patches of trees in the central Amazon

  D.radiocarbon-dating ingredients contained in forest soils

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• 3What does Glaser say about the regrowth of rainforests、

  A.They take centuries to regrow after being burnt.

  B.They cannot recover unless the vegetation is burnt completely.

  C.Their regrowth will be hampered by human habitation.

  D.They can recover easily after slash-and-burn farming.

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• 4From the passage it can be inferred that ________.

  A.human activities will do grave damage to rainforests

  B.Amazon rainforest soils used to be the richest in the world

  C.farming is responsible for the destruction of the Amazon rainforests

  D.there once existed an urban civilization in the Amazon rainforests

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• 5More and more young Europeans remain single because ________.

  A.they are driven by an overwhelming sense of individualism

  B.they have entered the workforce at a much earlier age

  C.they have embraced a business culture of stability

  D.they are pessimistic about their economic future

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