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"Translation of the English version of El Mundo21, 4th edition"--T.p verso.
Every lesson has two sections: The ¡A escuchar! section accompanies the Lab Audio CD Program, and includes: listening, speaking, and writing practice pronunciation exercises The ¡A explorar! section, correlated with the text lessons, offers: contextualized and personalized activities that give students the writing exposure needed with the grammatical concepts being reviewed reinforcement of vocabulary through a variety of exercises including crossword puzzles, word searches, etc open-ended, communicative topics for personalized writing. An answer key to all written exercises is provided so that students can monitor their progress throughout the program.
This volume explores the scientific frontiers and leading edges of research across the fields of anthropology, economics, political science, psychology, sociology, history, business, education, geography, law, and psychiatry, as well as the newer, more specialized areas of artificial intelligence, child development, cognitive science, communications, demography, linguistics, and management and decision science. It includes recommendations concerning new resources, facilities, and programs that may be needed over the next several years to ensure rapid progress and provide a high level of returns to basic research.