Final answer:
Annie hears the voice of Dr. Howe reading the report about Laura Bridgman.
Step-by-step explanation:
The voice that Annie hears reading the report about Laura Bridgman in the passage is that of Dr. Howe. Dr. Samuel Gridley Howe was the first director of the Perkins Institute and was known for his work with Laura Bridgman, who, like Helen Keller, was deaf and blind. Dr. Howe's work greatly influenced Annie Sullivan, Helen Keller's teacher. Although she didn't literally hear Dr. Howe's voice, the report she read would have been informed greatly by his experiences and teachings.