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1. The rooftop garden project is common and popular in the country is a demonstration project and costs the city government 1.5 million dollars will make the ordinary cooling down of the city in summer unnecessary aims at getting people involved and understanding their impact on the environment 2. What can we learn about the City Hall? It was built ninety years ago and is the most outstanding feature in the center of the city. It is originally proper to build a garden on the top of the City Hall. The temperature on its top is a little bit lower than that on the street below. It is the first building in America to have a garden on it. 3. Which of the following statements is TRUE? Every year, Chicago spends about $4,000 on cooling the city. The design of the garden on the City Hall specially takes into consideration the weight the roof can stand. The Mayor urged the environmental department to look into rooftop gardens in Hamburg and build similar ones in America. Heat islands mainly refer to those dark-colored rooftops which receive and retain heat and will not easily release the heat. 4. Why should the rooftop garden be built on the top of City Hall other than on any other buildings? | 
