题目内容
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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题目内容
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