. As there is less and less coal and oil scientists are exploring new ways of making use

问题补充：

. 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

答案：

A. primary

(答案→)B. alternative

C. instant

D. Unique

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