范例6 In a world with limited land, water and other natural resources, the harm from the traditional business model is on the rise. Actually, the past decade has seen more and more forests disappearing and globe becoming increasingly warm. People now realize that this unhealthy situation must be changed, and that we must be able to develop in sustainable (可持续的)ways. That means growth with low carbon or development of sustainable products. In other words, we should keep the earth healthy while using its supply of natural resources. Today, sustainable development is a proper trend in many countries....In recent years the markets for sustainable products have grown by more than 50%. ● What is the main purpose of the passage? _________ A. To introduce a new business model. B. To compare two business models. C. To predict a change of the global market. D. To advocate sustainable development.