Use of English · Parte 2
(0) FOR years now, scientists have (1) .......... warning us about global warming, patiently explaining how the human race has been producing massive amounts of pollutants (2) .......... the start of the Industrial Revolution. The theory is (3) .......... the amount of carbon dioxide in the air, which is generated as…
Desbloquea todos los exámenes, simulaciones ilimitadas, las 80 fases del juego y mucho más.