(教材对话原文) Michael: They are testing the 3D printer. Don’t you come and see it? Lucas: What? Never heard of it. Michael: It is one of the most latest technological innovations. Lucas: Really?{A; B; C; D; E}. Michael: Come on! You should learn to be open-minded. Lucas: {A; B; C; D; E} Michael: The 3D printing technology could be used in construction, engineering, biomedicine, and many other fields. It can print anything, a house, a car, even a liver! Lucas: That can’t be true. I will never believe this. Michael:{A; B; C; D; E}.All these will be absolutely carried out by 3D printers. There’s a company called Natural Machines has introduced a 3D printer for food producing. Lucas: I guess that there are a lot of procedures involved in this process. So this printer must be very big. Michael:{A; B; C; D; E}. It can print all kinds of dessert and starter. Lucas: Is it expensive? Michael:{A; B; C; D; E}.