Watching television is an important activity of children. Children in the United States watch an average of three to four hours of television a day. By the time of high school graduation(毕业), they will have spent more time watching television than they have in the classroom. Time spent watching television takes away from important activities, such as reading, school work, playing, exercise, and family talks. Children who watch a lot of television are likely to. · Have lower grades in school · Read fewer books · Have problems with attention · Exercise less · Be too fat Parents can help by: · Watching programs with children · Selecting appropriate (恰当的) shows · Placing time limits on the television watching · Turning off the TV during family meals and study time Choose shows that meet the developmental (发展的，成长的) needs of your child. Some children’s shows on TV are good, but soap operas, and adult talk shows are not. Set certain periods when the television will be off. Study times are for learning, not for sitting in front of the TV doing homework. Meal times are a good time for family members to talk with each other, not for watching television. Which program is appropriate for the children