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　　The popularization of TV makes it possible for children to watch TV programs both at home and school. This is an effective access to extra-curricular knowledge, but the problems caused by watching TV need to be addressed.

　　There is no doubt that children ca scope of knowledge by watching informative and educational programs. Being exposed to these programs, children would have a better understanding of nature, history and culture. In many schools, TV is adopted in class as a tool to aid teachers to impart knowledge of various subjects. Also,watching TV is a good way for children to refresh themselves and reduce the stress in their study. When they get tired pf reading books or doing math, they can take a break by watching interesting TV programs and return to the study with higher efficiency.

　　However, watching TV without appropriate supervision can be harmful to children's learning and growth. Due to the lack of self-control, some children may get addicted to TV series, wasting their precious time and distracting them from the study. When the amount of time spent in watching TV goes up, children would have less time to improve their social skills and do physical exercises. Another problem is that some programs may set a bad example and mislead children behavior, as children tend to be influenced by characters they see on television.

　　Overall, children can be allowed to watch TV at home and school and the important thing is that teachers and parents need to control the screen time and supervise children in selecting suitable programs.(264 words)