B.alternative energy production is no less than convnentional energy production
C.they are the most typical conventional energy resources from public lands
D.geothermal resources are more important than the other two
34、There 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
35、Public 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
36、根据材料,完成36-41题。
第二篇
Putting Plants to Work
Using the power of the sun is nothing new. People have had solar-powered calculators and buildings with solar panels (太阳能电池板) for decades. But plants are the real experts.
Theyve been using sunlight as an energy source for billions of years.
cells in the green leaves of plants work like tiny factories to con.vert sunlight, carbon dioxide (二氧化碳), and water into sugars and starches (淀粉), stored energy that the plants can use. This conversion process is called photosynthesis (光合作用). Unfortunately, unless youre a plant, its difficult and expensive to convert, sunlight into storable energy. Thats why scientists are taking a closer look at exactly how plants do it.
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