单选题Though ______ rich, ha was better off than at any other period in his life. [A] by any means [B] by some means [C] by all means [D] by no means

单选题Guilin is famous ______ its beautiful scenery.

单选题She ______ to her teacher for coming to school late.

单选题To tell you the truth, it's very hard for us to help them get rid of Internet addiction. But we ______on this problem trying to improve the situation.

单选题We have no figures on the number of workers employed in the ______ stages of iron production. A. various B. variable C. varied D. variant

单选题阅读下列短文，然后根据短文的内容从每小题的四个选择项中选出最佳的一项。A　　When you go on your job interview（面试）,be sure to dress well, be on time, do your research and NEVER ask any of the following questions :1." How quickly could I be

单选题 Google researchers have used artificial intelligence (AI) to teach robots how to move like real animals (in this case, dogs). They describe 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 Sehoon Ha, Research Scientist, Robotics at Google. They achieved this impressive feat by using something called reinforcement learning (RL). 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 walking to dynamic 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-efficient 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.

单选题A: Are you feeling better now?B: ______

单选题Only if you work hard every day ______ pass the exam.

单选题Telecommuting, ______ the computer for the trip to the job, has been hailed as a solution to all kinds of problems related to office work.

单选题Which of the following statements about small business is not true?

单选题Speaker A: Well, we want to thank you for coming to the studio today, Kiki. It's nice to meet you. Speaker B: Oh, thank you. ______

单选题After Man has dreamed about flying for a long time. Michael Moshier is a dreamer. He invented the Solo Trek. The Solo Trek had a 120 horsepower engine with twin fans. Only one person flies. As you fly above the roofs, you lean a little forward. You can see everything under you. You are flying like Superman. Michael Moshier looked at the jet belt and the rocket belt that was developed 20-30 years ago. Nothing ever came from them. People still can't fly. Inventors have tried to make it easy for people to fly. Paul Moller has been working on his flying car for 30 years. He now says it is ready for tests. It would take off and land vertically, go 600 miles an hour, and deliver 20 miles to the gallon. A computer would do the actual flying. He says it could be sold next year for about a million dollars. NASA is working with Moshier to help develop his flying machine. The first users are likely to be military. It's been 50-years since Robert Fulton invented his airphibian, a flying car. It flew, and is now in the Smithsonian Museum. Getting dreams to fly is never easy.

单选题"I don't like this ink. Do you like it?" "No. I like ______ ink. "

单选题 Jack knows the rules but does not know how to ______ it.

单选题I"m sorry to have ______ you with so many questions on such an occasion.

单选题Speaker A: Hello. May I speak to Sally, please?Speaker B:______

单选题The official statistics on productivity growth ______.