Sixth-form boys and girls can surely do no better than go to a movie with Alistair Cooke, who has made it a great part of his life's business to go to movies both in America and England, and to broadcast brilliantly about them. In America he met and worked with Charlie Chaplin himself, and perhaps he may tell a story of him in his talk this afternoon. If listeners want to know more about Alistair Cooke , he is to be featured next week in ' People you Hear.'