Spectrum 1A: A communicative course in English - Abrams, Sharon; P. Rein, David (Estados Unidos: Longman, 1992)
Spectrum is a complete six-level course for adult and young adult learners of English featuring a unique natural approach to lanuage learning: Rich language input is providede in authentic conversatins accompanied by receptive activities that help students absorb new functions, structures, and vocabulary.
Keywords: Ingles -- Ejercicios