单项选择题
A．26 years. B．33 years. C．44 years. D．57 years.
A．The End of the U. S. Civil War B．The Library of Congress C．Voices from the Days of Slavery D．The Recordings of Written Stories
A．They are told in the slaves' own voices. B．People travel around the world to hear them. C．Colored people were sold. D．They happened in the slavery time.