We can understand from the passage that…….

Because television plays such a great part in our lives, it is easy to forget that it is a very recent invention. Young people under the age of twenty five, or thereabouts, are the first generation to have lived with television all of their lives and many people who are little more than middle-aged will remember that the radio made its first appearance in their lives during their childhood. Now there are few households in Britain without a television or a radio set yet the most popular television programmes can attract audiences of twenty to twenty five million viewers. It is not unusual for someone to spend over twenty hours a week in front of a television set. Television has certainly become the most important source of entertainment and infor¬mation for a great number of people. There will always be arguments over whether television and radio have a harmful effect on us. What is undeniable is that they will be with us for some time and we will be able to make better use of them if we know the range of programmes they provide. This might even help us to appreciate the programmes and therefore gain more from our viewing and listening.