单项选择题A．He taught his students how to pronounce the letters first.B．He matched the letters with the sounds familiar to the learners.C．He showed the learners how to combine the letters into simple words.D．He divided the letters into groups according to the way they are written.

单项选择题A．To do comprehensive exercises.B．To read simple sentences.C．To copy out from the textbooks.D．To do all of the above.