Questions 51 to 55 are based on the following passage-|||-Google researchers have used artificial intellige (AI) to teach robots how to move like real animals in this case,-|||-dogs).They descnibe their experiment in a blog released this week-|||-"First,we describe how robots can learn to move like a real animal by imitating their motions, producing fast and fluent-|||-movements like running slowly and hopping Then,we discuss a system for automating the training of moving skills in the-|||-real world, which allows robots to learn to walk on their own,with minimal human assistance,"shared in the blog Xue Bin-|||-(Jason) Peng,Student Researcher and Schoon Ha,Research Scientist,Robotics at Google-|||-They achieved this impressive feat by using something called reinforcement learning (R They began by taking a-|||-reference video recorded from an animal and using RL to get the robot to imitate an animal`s movement-|||-"By providing the system with different reference motions,we are able to train an animal shaped robot to perform a-|||-diverse set of agile behaviors, ranging from fast w walking to dynamie hops and turns,The policies are trained primarily in-|||-simulation(模拟,模仿),and then transferred to the real world using a space adaptation technique that can efficiently adapt-|||-a policy using only a few minutes of data from the real robot,"wrote the researchers in their blog.-|||-However, it is a well-known fact that simulators provide a poor approximation of the real world,meaning that-|||-simulations don`t perform well in reality.This is where the researchers decided to use a sample-efficicnt space adaptation-|||-technique-|||-They did so by introducing an element of randomness to the physical parameters(参数)used in the simulation by varying-|||-physical quantities, such as the robot`s mass and friction This resulted in a machine learning model that could account for all-|||-kinds of small changes and the complications they create-|||-The end result is a robot that moves like a real dog.This kind of work is crucial as it can open opportunities to use robots-|||-to do sophisticated tasks in the real world.-|||-51.What is Google rescarchers`experi about?-|||-A)Developing the first AI dog like robot-|||-B) Training robots to move like a real dog.-|||-C)Making a running dog video with Al tech.-|||-D) Designing a new AI device to make robots.-|||-52.How did the researchers make the breakthrough?-|||-A) By using bionic technology-|||-B) By using 3-D printing tech-|||-C) By employi ing the method of RL-|||-D) By upplying the 5G technology-|||-53.Why did rescarchers decide to use a sample efficient space adaptatio technique?-|||-A) Because they hated to experiment on animals.-|||-B) Because they intended to reduce research cost-|||-C) Because the robotic technology was unable to update.-|||-D) Because simulators don`t simulate the real world well.-|||-54.What have researchers taken into account to simulate the reality?-|||-A) The mass and friction of f the robot.-|||-B)The color and sound of the robot.-|||-C) The light and the space of the lab-|||-D) The competence of the operator.-|||-55.Why is the new technology Google developed so important?-|||-A) Because it has shed new light on cloning technology,-|||-B) Because it has opened chances for us to control robots-|||-C) Because it can promote the application of robotic technology.-|||-D) Because it can enable robots to do more tasks in the laboratory.