Before people found and utilized fossil-fuel in transportation, the energies to power vehicles are ( ).
The action of human muscles and wind
举一反三
- Before people found and utilized fossil-fuel in transportation, the energies to power vehicles are ( ). A: Solar energies and wind B: Charcoal and coal C: The action of human muscles and wind D: Wood and coal
- Already there are many ( ) fuel vehicles on the market, powered by anything from solar power to natural gas.
- Electricity generated from hydroelectric dams and wind power is more _______ than fossil fuel generated power.
- 交通工具和设施 A: transportation vehicles B: transportation vehicles and facilities C: vehicles and facilities D: transportation and facilities
- It is predicated that existing reserves of fossil fuel ____________ by 2045.
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People found directions at sea by the help of _______ before the compass was invented.
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Brazil is the world’s second largest producer of ______. A: biofuel B: fossil fuel C: corn fuel D: ethanol fuel
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中国大学MOOC: Renewable energies are not competitive with fossil fuels in consideration of health and environmental cost.
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What two effects does burning fossil fuel have?
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There is a large amount of fossil fuel on earth, but the sun supplied a(n) (limit) __________ supply of energy.