Born in Scotland in 1847, Alexander Bell became interested very early in methods of human communication. He was influenced by his father and grandfather, who spent years working with deaf people and those with faulty speech. Bell's father even go so far as to develop a system of so-called "visible speech" for the deaf. He used sketches of the different positions of the lips and tongue. This science of visible speech formed the foundation of Voung Bell's knowledge of the mechanics of human speech.
1. D
2. D
3. A
4. B
5. C
6. A
7. D
8. B