Scientists have found _____for oil as fuel. Coal, natural gas, solar power, nuclear power and even water can replace it as sources of energy.
A.consequences | B.substitutes |
C.requirements | D.contrasts |
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Scientists have found _____for oil as fuel. Coal, natural gas, solar power, nuclear power and even water can replace it as sources of energy.
A.consequences | B.substitutes |
C.requirements | D.contrasts |