单选题 Tiny technologies are a key to the future of robots. The old science-fiction notion of a robot pictured a large machine that（请作答此空） .But a visitor to the Artificial Intelligence Laboratory at Cambridge（2）. In this micro-world, scientists and engineers are building new machines in other fields such as medicine and aerospace. Soon, you 'll be driving smart car and living in smart home that（3）.It is already clear that our tiny new tools（4）.By “thinking small,"scientists and dreamers are enlarging and enriching the future for all of us.