Read the story and answer the questions to test your comprehension.
Television, or TV, has been around in most countries since the 1930's. Soon after TVs started popping up in most American homes, advertising was introduced in 1940. Both TV technology and TV advertising have developed a lot since those days. An ad during the Super Bowl football game, for example, can cost several million dollars. Ever since the 1970's, cassettes and other media have been available to record television and watch it later.