Internet is dangerous if a child has unlimited freedom to use it. Because teenagers are too weak to resist the great tempt.
Various online games will cost their almost all-day time. And many kinds of online movies may teach them unhealthy content such as violence. Also, long-time exposure to computer will do great harm to teenager's eyesight.
A child addicted to Internet will neglect his study completely. However, the word limit does not mean forbidding. It can't be denied that internet is a very useful tool for learning. In this information age, computer and internet is essential. Adequate access to internet will contribute to teenagers keeping pace with this world.
Also, internet is a fine entertainment for students who have study longtime and get tired.
So, I think parents should set limits on but not forbid access for their teenager children.
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