听力原文： A boy became interested in computers at the age of eight, and by eighteen he was

suffering from a computer related disease. It is said that the boy was so obsessed with computers that he acquired a "mechanical disillusioned mentality, " which inhibited his emotional development and caused him to think and dream in computer language.

"For example, "the boy said, "I could wake up in the night and think: Line 10 go to the bathroom. "The young man was so disoriented that he lost his ability to tolerate the ambiguity of normal human interactions, instead requiring precise and literal instructions -- much like computer commands -- in order to complete simple tasks.

Bord, a psychologist, says that computer-obsessed kids and adults often suffer such symptoms, and people are going to see a generation of kids growing up who are losing access to human emotion. They develop machine standard for themselves, and he feels that this does not portend well for their healthy development.

When did the person suffer from the computer related disease？

A．At the age of 7.

B．At the age of 8.

C．At the age of 9.

D．At the age of 18.