Documents ACS 106 LANGUAGE LEADER / PRE-INTERMEDIATE. UNIT 7 : SCIENCE .

Slide 1 ACS 106 LANGUAGE LEADER / PRE-INTERMEDIATE Slide 2 UNIT 7 : SCIENCE  http://www.youtube.com/watch?v=9nvP_ZJCo6E http://www.youtube.com/watch?v=9nvP_ZJCo6E Slide…