Petroleum, sunlight and wind power.
Gas, water and fossil fuels.
Coal, natural gas and hydropower.
Sunlight, water and wind power.
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As there is less and less coal and oil, scientists are exploring new ways of making use of ____ energy, such as sunlight, wind and water for power and fuel.
A. primary B. alternative C. instant D. unique
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A、source
B、material
C、power
D、energy
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