The scientists all over the world are trying their best to develop _____ energy, such as sunlight, wind and
water for power and fuel.

A. unique
B. alternative
C. primary
D. instant
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科目：高中英語 來源：河南省期中題 題型：單選題

The scientists all over the world are trying their best to develop _____ energy, such as sunlight, wind and
water for power and fuel.
[     ]
A. unique
B. alternative
C. primary
D. instant

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