jueves, 23 de junio de 2016

Fioretti, Lucas: He likes to skate, swim and ride motorcycles.

Record audio or upload mp3 >>

passive voice:
This was called alchemy.

Record and upload audio >>

Since the 1920s, the increased understanding of physics has changed chemists' theories about chemical reactions

Record and upload audio >>

The chemistry is divided into many subjects

Solutions are made by reactives

Some substances are used as indicators

No hay comentarios.:

Publicar un comentario