英语四级听力练习集锦3（在线收听）

Children in the United States are exposed to many influences other than that of their families.

Television is the most significant of these influences, because the habit of watching television usually begins before children start attending school.

And, by the time that the average child finishes high school,He or she will have spent 18,000 hours in front of a television set as opposed to 12,000 hours in a classroom.