What is the main idea of this passage、

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• 1To protect our ecosystems we should not use more than_______

  A.our share of resources

  B.a biological creature

  C.a given area

  D.the maintenance of the ecosystem

  E.the source of food

  F.various species

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• 2Plants, animals and humans are all effective in_______

  A.our share of resources

  B.a biological creature

  C.a given area

  D.the maintenance of the ecosystem

  E.the source of food

  F.various species

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• 3Plants are essential in an ecosystem because to other living creatures they are_______

  A.our share of resources

  B.a biological creature

  C.a given area

  D.the maintenance of the ecosystem

  E.the source of food

  F.various species

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• 4In an ecosystem, plants, animals and humans live together in_______

  A.our share of resources

  B.a biological creature

  C.a given area

  D.the maintenance of the ecosystem

  E.the source of food

  F.various species

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• 5Paragraph 5_______

  A.What can we do to help protect ecosystems、

  B.What are different types of ecosystems、

  C.What is an ecosystem、

  D.What destroys ecosystems、

  E.How does an ecosystem work、

  F.Why are ecosystems important、

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• 6Which of the following statements is true of public lands in the U. S. 、

  A.The majority of undiscovered natural gas is stored there.

  B.Half of US energy is produced there.

  C.Most of coal was produced from there in 2000.

  D.Most energy resources are reserved ther

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• 7Geothermal resources, wind turbines, and hydropower facilities in Paragraph 4 cited as examples to illustrate that_______.

  A.the amount of alternative energy production from public lands is huge

  B.alternative energy production is no less than conventional energy production

  C.they are the most typical conventional energy resources from public lands

  D.geothermal resources are more important than the other two

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• 8There is a mounting pressure on public lands to satisfy US energy demands_______.

  A.the U. S. is demanding more and more energy

  B.many Americans are unhappy with energy development in foreign countries

  C.quite a few public lands are banned for energy development

  D.many Americans think public lands are being abused

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• 9Public lands can be used for energy development when_______.

  A.energy development restrictions are effective

  B.federal land managers grant permissions

  C.they go through the land use planning process

  D.there is enough federal budget

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• 10"Poorer children" and "hungry people" are mentioned in Paragraph 2 to show_______.

  A.humans' senses are influenced by what's going on in their heads

  B.they have sharper senses than others

  C.they lose their senses because of poverty and hunger

  D.humans' senses are affected by what they see with their eyes

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