Source: http://www.cafepedagogique.net/communautes/MarcCourbot/Documents/-%20TS%20sp%C3%A9cialit%C3%A9%20-/Premier%20Contact/TS%20sp%C3%A9cialit%C3%A9%20-%20Premier%20contact%20-%20Exercices%20corrig%C3%A9s%20de%20type%20BAC.pdf