Sobre la 1era revolución industrial: aumento de la producción. cambios tecnológicos. principales descubrimientos técnicos que hicieron posible la mecanización del trabajo. gracias
Record yourself giving a performance of as much of each of the "five mini-dialogues" as you can in spanish. review the conversations for a few minutes if you need, and when you are ready, just click on the record button. you can review your performance by clicking replay.