31题：What ia the main idea of this passage?

　　B:Public lands  play an important role in energy production.

　　32题：Which of the following statements is true of public lands in US?

　　A the majority of undiscovered natural gas is stores there.

　　33题：geothermal resources，wind turbines，hydropower facilities in Para.4 are cited as examples to illustrate that

　　B: Alternative energy production is no less than conventional energy production.

　　34题：There is a mounting pressure on public lands to satisfy US energy demands because

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

　　35题: Public lands can be used for energy development when

　　C：they go through the land use planning process.
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