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 |
推荐套卷
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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