El círculo y la flecha

This highly innovative beginning Spanish text is both task-based (requiring students to use Spanish to complete specific goals or tasks) and content-based, including readings from a variety of disciplines. ¿Sabías que...? represents the practical application of the theories and research presented in Lee and VanPatten's methods text, Making Communicative Language Teaching Happen (a natural companion volume for instructors using this text). The new edition is accompanied by a new CD-ROM, a new Online Learning Center, and more!

¡¡Aprende física!! Si quieres aprender de forma rápida y sencilla todo lo que necesitas saber sobre física, ¡ésta tu guía! La autora es una psicóloga experta en el tratamiento de dificultades del aprendizaje con una amplia experiencia docente. ÍNDICE ACÚSTICA: 1. Acústica. 2. Sonido. 3. Características del sonido. 4. Medida del sonido. 5. Frecuencia de sonido 6. Velocidad de propagación del sonido. 7. Tipos de onda: longitudinales, transversales y estacionarias. 8. Interferencia. 9. Longitud de onda. 10. Concordancia de fase. 11. Relación entre sonido y temperatura. 12. Eco....

IMPORTANT NOTICE: The Smart Sparrow Companion Website will not be available after December 31, 2020. It is free to access until that date. Workbooks with exercises from the Smart Sparrow companion website are now available for purchase, as are Workbook Answer Keys. They will both be sold in eBook format only. eTextbooks are now available through VitalSource! Please visit VitalSource.com for more information. About Gramática para la composición, tercera ediciónIntegrating grammar and composition, this best-selling textbook guides the advanced student through progressively more complex types ...

Accompanied by audio exercises and downloadable mini-dialogs for practice in usage and review, offers 555 fully conjugated verbs, current idioms and expressions for each verb, extended usage examples, and more than 2,500 verbs cross-referenced to conjugation models.