Fossilfuelsareandwillbestill______foratleastthenexttwo-threedecadesatrelativelylowcosts.
A.productive B.convenient C.renewable D.available正确答案D
Fossilfuelsareandwillbestill______foratleastthenexttwo-threedecadesatrelativelylowcosts.
A.productive B.convenient C.renewable D.available正确答案D