题目

In some science-fiction movies, robots refuse to die no matter how people fight back (反击). Now, it has turned into a fact. For the first time, researchers have created a robot that can take a beating (挨打) and keep on working. Developed by scientists from Cornell University and the University of Vermont, the new robot looks like a spider with four legs.Until now, even the most advanced robot was almost certain to break down when damaged. That’s because its computer doesn’t know how to operate the machine after its shape has been changed.To solve this problem, the scientists put someShanghai is one of _____ in the world.A. the most beautiful city B. the most beautiful cities C. most beautiful cities