单选题I dont doubt ______ the stock market will recover from the economic crisis. A) if B) what C) that D) which

单选题The author's purpose of writing the third paragraph is ______

单选题We must _____ that the experiment is controlled as rigidly as possible.

单选题Ever since Muzak started serenading patrons of hotels and restaurants in the 1930s, piped-in music has been part of the consumer experience. Without the throb of a synthesiser or a guitar"s twang, shoppers would sense something missing as they tried on jeans or filled up trolleys. Specialists like Mood Media, which bought Muzak in 2011, devise audio programmes to influence the feel of shops and cater to customers" tastes. The idea is to entertain, and thereby prolong the time shop pers spend in stores, says Claude Nahon, the firm"s international chief. Music by famous artists works better than the generic stuff that people associate with Muzak. The embarrassing brand name was dropped in 2013. Online shopping is an under-explored area of merchandising musicology. A new study commissioned by eBay, a shopping website, aims to correct that. Some 1,900 participants were asked to simulate online shopping while listening to different sounds. Some results were unsurprising. The noise of roadworks and crying babies soured shoppers" views of the products on offer. Chirruping birds encouraged sales of barbecues but not blenders or board games. Sounds associated with quality and luxury seemed to be hazardous for shoppers" wallets. The study found classical music and restaurant buzz caused them to overestimate the quality of goods on offer and to pay more than they should. That backs up earlier research which found that shoppers exposed to classical music in a wine store bought more expensive bottles than those hearing pop. EBay wants consumers to avoid such unhealthy influences when shopping online. It has blended birdsong, dreamy music and the sound of a rolling train—thought to be pleasant but not overly seductive—to help them buy more sensibly. Retailers could presumably counter by turning up the Chopin. "Classical music does seem to be the way to go" if your only interest is the narrow one of squeezing as much money as possible from your clientele, says the study"s author, Patrick Fagan, a lecturer at Goldsmiths, part of the University of London. Few traditional shops are likely to use that tactic. H&M, a clothes retailer, airs "trendy, up-tempo" music from new artists, while Nespresso"s coffee boutiques go for "lounge-y" sounds, says Mr. Nahon. Grocery stores, with a broad following, play top 40 hits. The tempo tends to be slower in the mornings, when shoppers are sparser and older, and becomes more quick and lively as the day goes on.

单选题If you plant two apple trees in one square yard of land, and the trees' productivity ______ decline.

单选题The popular notion that older people need less sleep than younger adults is a myth, scientists said yesterday. While elderly people 25 to sleep for fewer hours than they did when they were younger, this has a(n) 26 effect on their brain's performance and they would benefit from getting more, according to research. Scan Drummond, a psychiatrist (生理医生) at the University of California, San Diego, said that older people are more likely to suffer from broken sleep, while younger people are better at sleeping 27 straight through the night. More sleep in old age, however, is 28 with better health, and most older people would feel better and more 29 if they slept for longer periods, he said. 'The ability to sleep in one chunk (整块时间) overnight goes down as we age but the amount of sleep we need to 30 well does not change, ' Dr Drummond told the American Association for the Advancement of Science conference in San Diego. 'It's 31 a myth that older people need less sleep. The more healthy an older adult is, the more they sleep like they did when they were 32 . Our data suggests that older adults would benefit from 33 to get as much sleep as they did in their 30s. That's 34 from person to person, but the amount of sleep we had at 35 is probably the same amount as we need at 75.' A. alert B. associated C. attracting D. cling E. continuing F. definitely G. different H. efficiently I. formally J. function K. mixed L. negative M. sufficient N. tend O. younger

单选题Regular use of this moistening cream will help to ______ the rough, dry condition of your skin. A. alleviate B. abstract C. evaporate D. abbreviate

单选题Your explanation is still not easy enough to understand. Could you give any______ examples?

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.