If you haven't been able to buy the textbook yet or it is unavailable at the moment, you can find Unit 1 here.
Unit 4 here. The .pdf document is from NGL Life Series Sample units.
Thursday, 6 October 2016
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2 comments:
You also have the unit 4 on another section of national geographic websiste http://ngl.cengage.com/assets/downloads/life_pro0000000047/sample_unit_4_life_advanced.pdf
Thanks, José
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