听力原文：M: Good evening and welcome to our program. Our guest is Mrs. Green, who is an expert in the field of environ mental protection. Welcome to our program, Mrs. Green. W: Thank you. M: Well, we hear it a lot in the news these days: 'Recycle newspapers and save a tree. Collect bottles and cans so they can be reused in the manufacturing of new products.' But how to promote the recycling movement? Can you give us some suggestions? W: I think there are three essential keys. M: What is the first one? W: The first key is to have a more informed public, that is, to raise public awareness about the recycling process, to explain the kinds of materials that can be recycled, and provide ways on how to properly dispose of them. Local governments should educate the public on how to properly sort reusable materials from those, like waxed paper, carbon paper, plastic material such as fast food wrappers, that can't be recycled very easily. M: Then what is the second key? W: The second is the development of improved technology. Technological progress has been made on many fronts, but governmental agencies need to step up their support for companies involved in recycling by providing tax incentives, low-cost loans, or even grants to upgrade equipment and to encourage further research. M: So what about the third essential key? W: The final key is to develop a greater demand for recycled materials. This means increasing demand for the growing surplus of resources waiting to be recycled. M: Recycling is a crucial link protecting our planet. The three keys Mrs. Green mentioned are important ways to achieve this end. Thanks for joining us, Mrs. Green. W: You're welcome. (23)