As there is 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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As there is 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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