单选题The police tried in vain to break up the protest crowds in front of the government building.A. unskillfullyB. violentlyC. ineffectivelyD. eventually

单选题Early cancer screening Can help reduce significantly

单选题Different {{U}}hypotheses{{/U}} have been put forward to explain why UFOs exist.

单选题Recent pressure at work may account for his behavior.

单选题It has been said that the Acts provided a new course of action and did not merely {{U}}regulate{{/U}} or enlarge an old one. A. control B. limit C. replace D. offset

单选题We have taken effective measures to preserve our natural resources.A. protectB. reserveC. consumeD. save

单选题Tom is still full of beans at 70.A. courageousB. kindC. energeticD. single

单选题Revolutionary developments in China's astronomy took place in the 1960's.A. commencedB. occurredC. were disputedD. were exchanged

单选题CT Scans and Lung Cancer Small or slow-growing nodules (小结节) discovered on a lung scan are unlikely to develop into tumors over the next two years, researchers reported on Wednesday. The findings reported in the New England Journal of Medicine, could help doctors decide when to do more aggressive testing for lung cancer. They could also help patients avoid unnecessarily aggressive and potentially harmful testing when lesions (损伤) found. Lung cancer, the biggest cancer killer in the United States and globally, is often not diagnosed until it has spread. It kills 159,000 people a year in the United States alone. The work is part of a larger effort to develop guidelines to help doctors decide what to do when such growths, often discovered by accident, appear in a scan. High-tech X-rays called CT scans can detect tumors-but they see all sorts of other blobs (模糊的一团) that are not tumors, and often the only way to tell the difference is to take a biopsy (活检), a dangerous procedure. At the moment, routine lung cancer screening is considered impractical because of its high cost and because too many healthy people are called back for further testing. Good guideline could help make lung cancer screening practical, Dr. Rob van Kiaveren of the Erasmus Medical Center in Rotterdam, the Netherlands, who led the new study, said in a telephone interview. The team looked at 7, 557 people at high risk for lung cancer because they were current and former smokers. All received multidetector (多层螺旋) CT scans that measured the size of any suspicious-looking modules. Volunteers who had nodules over 9.7 mm in width, or had growth of 4.6 mm that grew fast enough to more than double in volume every 400 days, were sent for further testing. Of the 196 people who fell into that category, 70 were found to have lung cancer, 10 additional cases were found years later. But of the 7, 361 who tested negative during screening only 20 lung cancer cases later developed. In a second round of screening done one year after the first, 1.8 percent were sent to the doctor because they had a nodule that was large or fast-growing. More than half turned out to have lung cancer. The result means that if the screening test says you don't have lung cancer, you probably don't, the researcher said. "The chances of finding lung cancer one and two years after a negative first-round test were 1 in 1,000 and 3 in 1,000 respectively, "they concluded.

单选题Online Cancer Chat with A Safety Net Cancer Research UK has launched an online chat forum for cancer patients to swap stories and share experiences on how to cope with such a devastating disease. But Cancer Chat is a forum with a difference: it has an information safety net. This means that a Cancer Research UK team will keep a watching brief to ensure that patients are not subjected to rogue "cancer cures" or scientifically unsound information. Anyone can have access to the messages posted on Cancer Chat but if people wish to post a message they will need to register. And Rebekah Gibbs, cancer patient and star of TV"s Casualty has pledged her support for the new project. "I think Cancer Chat is a brilliant idea," she said. "I have written a public diary about what I went through with breast cancer and I have had such a heart-warming response from other people going through the same thing." "The idea of a Cancer Chat forum means you can share information about treatment and side effects and you can really open up about your feelings online in a way that can be difficult when talking to close friends and family. And with Cancer Research UK monitoring the forum people can be reassured about the quality of information being exchanged." Cancer Chat will also encourage its users to check out any cancer questions on its CancerHelp UK website which is specially designed to give patients and their families 6,000 pages of up-to-date information that is easy to understand and explains a wide range of treatments for different types of cancer and gives details of clinical trials. There is also a UK database of cancer clinical trials. The award-winning website attracts around one million visitors a month and Cancer Research UK hopes that some of these visitors will also want to post comments on the Cancer Chat forum. For those who do not have access to computers and have questions about cancer, the charity"s team of cancer information nurses are available during office hours to talk over patients" concerns on the phone.

单选题An hour later the visiting parents assembled in the school hall.

单选题Our lives are intimately bound up with theirs.

单选题She {{U}}exhibited{{/U}} great powers of endurance during the climb. A. played B. sent C. showed D. told

单选题This book gives a brief outline of the history of the castle and details of the art collection in the main hall.

单选题When Paul met Clara again 20 years later, he decided

单选题The man has acquired an important status in this company.A. caughtB. attachedC. compressedD. obtained

单选题This is not typical of English, but is a feature of the Chinese language.

单选题The new regulations will ______ into force on October 1st next year.A. comeB. becomeC. bringD. begin

单选题If human beings didn"t perspire , they would die in five minutes.

单选题Once upon a time there was a great Greek hero, Hercules. He was taller and stronger than anyone you have ever seen. On his shoulder he carried a club and in his hand he held a bow. He was known as the hero of a hundred adventures. Hercules was the tallest man in the world.A. RightB. WrongC. Not mentioned