单选题People Use Technology More, Sleep LessPeople in Britain now spend more time watching TV, gaming, and using their mobile phones and computers than sleeping. A study __31__ that British people use techn

单选题Most students choose “Homestay” accommodation when they study abroad：others select Homestay even if they are not on a study visit.Statistics show that it’s a form of accommodation gaining in popularit

单选题Peter will ______ as managing director when Bill retires.

单选题His dislike of the course may prove to be a ______ barrier he cannot overcome.

单选题He is a (an) ______ and well-behaved child, but his parents worry about him for he talks too little.

单选题In order to be a good scientist, ______.

单选题Smoking is so harmful to personal health that it kills people each year ______ than automobile accidents.

单选题As it is, sleep is so undervalued that getting by on fewer hours has become a badge of honor. Plus, we live in a culture that 26 to the late-nighter, from 24-hour grocery stores to online shopping sites that never close. It's no surprise, then, that more than half of American adults don't get the 7 to 9 hours of shut-eye every night as 27 by sleep experts. Whether or not we can catch up on sleep—on the weekend, say—is a hotly 28 topic among sleep researchers. The latest evidence suggests that while it isn't 29 , it might help. When Liu, the UCLA sleep researcher and professor of medicine, brought 30 sleep-restricted people into the lab for a weekend of sleep during which they logged about 10 hours per night, they showed 31 in the ability of insulin (胰岛素) to process blood sugar. That suggests that catch-up sleep may undo some but not all of the damage that sleep 32 causes, which is encouraging, given how many adults don't get the hours they need each night. Still, Liu isn't 33 to endorse the habit of sleeping less and making up for it later. Sleeping pills, while helpful for some, are not 34 an effective remedy either. 'A sleeping pill will 35 one area of the brain, but there's never going to be a perfect sleeping pill, because you couldn't really replicate (复制) the different chemicals moving in and out of different parts of the brain to go through the different stages of sleep,' says Dr. Nancy Collop, director of the Emory University Sleep Center. A. alternatively F. ideal K. presumption B. caters G. improvements L. ready C. chronically H. necessarily M. recommended D. debated I. negotiated N. surpasses E. deprivation J. pierce O. target

单选题 Questions14-16 are based on the passage you have just heard.

单选题Too much ______ to X-rays can cause skin burns, cancer or other damage to the body.

单选题In last year's Science study, researchers at Johns Hopkins University examined the relationship between stem-cell divisions and cancer development. They reported that the higher the number of stem-cell divisions in a given tissue, the higher risk for 28 cancer. At the time, they said that their findings suggested '65% of cancer...appears to be explained by the number of stem-cell divisions'. That stem-cell activity, the researchers suggested, could explain why some people without 29 factors like smoking will still get lung cancers. 'I was startled by their conclusion,' Dr. Yusuf Hannun says, a cancer researcher at Stony Brook University in New York and author of the new Nature study. Hannun and his team 30 that the first study assumed that stem-cell division and other environmental factors were 31 of each other. Hannun's team wanted to assess the 32 to which stem-cell division or environmental factors contribute to developing the disease. To do this, the researchers looked at a variety of data including epidemiological evidence that people living in different regions have different rates of cancer development. They also looked at cell-mutation patterns 33 with certain cancers, as well as mathematical models that helped parse how much a cancer was due to 34 factors like cell division versus extrinsic factors like environment or lifestyle. The new study reported that while intrinsic factors did have a 35 in cancer development, environmental factors had a more 36 effect and were responsible for 70%-90% of cancer cases. This isn't the last study to be published on the topic, but as scientists refine their 37 of the many things that can contribute to cancer risk, more information is needed. A. argue B. associated C. considering D. derived E. developing F. extent G. full H. independent I. intrinsic J. relation K. risk L. robust M. role N. seizes O. understanding

单选题Hardly anything ______ more than the happiness of seeing someone using his device for treatment. A. please him B. does please him C. pleases him D. does him please

单选题This one is ______ the most reasonable of all the projects proposed.

单选题In fresco painting to what is the paint applied?

单选题The puritan army executed the king, abolished the House of Lords, got the House of Commons to ______ England a "commonwealth", or republic.

单选题I waited for him half an hour, but he never ______.

单选题Now ways are found ______ these materials out of the rubbish and use them again. A. for taking B. to have taken C. to take D. taking

单选题A: I have two tickets for tonight's concert. Could you go with me? B: I'd like to, but I'm busy tonight. A: ______.

单选题How is virtual reality surgery performed?

单选题The doctor pondered for a while, trying to recall which of several medications would be best to ______ the patient's suffering.