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.