Use of English · Parte 2
Solar energy (0) IS derived ultimately from the sun. It can be divided (1) .......... direct and indirect categories. Most energy sources on Earth are forms of indirect solar energy, (2) .......... we usually don't think of them in that way. Coal, oil and natural gas derived from ancient biological material…
Desbloquea todos los exámenes, simulaciones ilimitadas, las 80 fases del juego y mucho más.