Warm-up Questions 1.What do you think of the way people live today?Are you satisfied with our life now on the Earth's surface?Please give reasons to support your point of view. 2.What do you suggest to solve the urban housing problem? 3.Do you think it would be reasonable for human beings to make their houses underground?Why?Warm-up Questions 1. What do you think of the way people live today? Are you satisfied with our life now on the Earth’s surface? Please give reasons to support your point of view. 2. What do you suggest to solve the urban housing problem? 3. Do you think it would be reasonable for human beings to make their houses underground? Why?