There are generally two things that decide the disability caused by deafness: one is the age at which hearing is lost, and the other is ______.

A．Mary left a lot of money to her friend.
B．Mary’s parents were very rich.
C．Mary got a lot of money from a friend.
D．Mary’s friend would come soon.

A．It is about English teachers in a school.
B．It is about teachers’ accomplishments.
C．It is about teachers’ frustrations.
D．It is about training of English teachers.