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正确答案B
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正确答案B
