单选题Things have changed a lot since I was a child.A. greatlyB. graduallyC. suddenlyD. frequently

单选题Life was not easy for many children living 100 years ago,

单选题Mary {{U}}called me up{{/U}} very late last night. A. shouted at me B. visited me C. telephoned me D. waked me

单选题The idea of test-tube babies may make you starry-eyed with delight at the wonders of modern medicine or bleary-eyed with considering the moral/legal implications of starting life in a laboratory. But if you've ever been pregnant(怀孕)yourself, one thing is certain: You wonder what it's like to carry a test-tube baby. Are these pregnancies normal? Are the babies normal? The earliest answers come from Australia, where a group of medical experts at the Queen Victoria Medical Center in Melbourne have taken a look at the continent's first nine seemed to proceed according to plan, but at birth some unusual trends did show up. Seven of the nine babies turned out to be girls. Six of the nine were delivered by Caesarean section(剖腹产术). And one baby, a twin, was born with a serious heart defect and a few days later developed life-threatening abdominal problems. What does it all mean? Even the doctors don't know for sure, because the numbers are so small. The proportion of girls to boys is high, but until there are many more test-tube babies no one will know whether that's pure coincidence(巧合)or something special. The same thing is true of the single heart defect; it usually shows up in only 15 out of 60,000 births in that part of Australia, but the fact that it occurred in one out of nine test-tube babies does not necessarily mean that they are at special risk. One thing the doctors can explain is the high number of Caesareans. The Australian researchers report that they are quite encouraged. All the babies are now making nomal progress--even the twin with the birth defects.

单选题Some astronomers {{U}}contend{{/U}} that the universe may be younger than previously believed.

单选题No part of New Hampshire is far from water.

单选题Which of the following is true of the experience-monitoring function?

单选题In a speech to schoolchildren last week that had some conservative opponents up in arms, President Obama delivered at least one line that seemed incontestable (无可不论的): "I hope you'll all wash your hands a lot, and stay home from school when you don't feel well, so we can keep people from getting the flu this fan and winter. "The Disney corporation is now marketing Musical Hand Wash Timers featuring characters like the Little Mermaid, and encouraging parents to "take precaution against swine flu" by teaching children to wash their hands correctly. "Studies prove that regular hand - washing dramatically reduces the spread of infection," says the Disney Web page, which links to the Centers for Disease Control and Prevention's Web site. What is the paragraph mainly about?A. It is publicized that hand - washing is an effective way to reduce the spread of swine flu.B. President Obama encouraged children to wash hands a lot to stay healthy.C. Disney corporation now is interested in public health affairs.D. Washing hands correctly is very important in reducing the spread of swine flu.

单选题Reading the job ad, he wondered whether he was {{U}}eligible{{/U}} to apply for it.

单选题Foreign military aid was prolonging the war.

单选题Techniques to employ the energy of the sun are being developed.

单选题He was {{U}}evidently{{/U}} holding light onto himself about something.

单选题This is especially true in today's extremely {{U}}harsh{{/U}} economic climate.

单选题Guests were {{U}}scared{{/U}} when the bomb exploded. A.frightened B.killed C.endangered D.rescued

单选题Mary has blended the ingredients.

单选题Some children do not like school. In Japan that familiar dislike has reached alarming proportions. About 50,000 unhappy youngsters a year (out of a total schoolage population of 20 million) suffer what Japanese behavioral experts call school phobia. School phobia is distinguished from other common childhood and adolescent psychological and emotional disorders by the patient's reaction to, and fear of, the idea of going to school. A doctor on a house call found a thirteen -year- old Tokyo boy who had not been to school in more than a year. He lived in a darkened room, receiving his food through a narrow opening under the door and lashing out violently at his parents if they came too close. Once the boy was placed in a psychiatric ward for treatment, he again became an open, seemingly healthy youngster. When he was sent home, however, his symptoms returned, and he was never able to go back to school. School phobia can be cured, usually with tranquilizers and psychological methods. Rehabilitation takes about two years. Yet victims who are put in clinics or mental wards often prefer to stay there. Their day is filled with activities liking knitting, painting, music, free time, and sports. The purpose of paragraph 2 is toA. show the large number of victims of school phobia.B. show that the problem can be cured.C. bring out the writer's point of view.D. present an example of school phobi

单选题The word "secured "in the last paragraph is closes in meaning to _______.

单选题He spoke in a temperate manner, not favoring either side especially.A. respectableB. moderateC. politeD. prudent

单选题Medicine Award Kicks off Nobel Prize Announcements Two scientists who have won praise for research into the growth of cancer cells could be candidates for the Nobel Prize in medicine when the 2008 winners are presented on Monday, kicking off six days of Nobel announcements. Australian-born US citizen Elizabeth Blackburn and American Carol Greider have already won a series of medical honors for their enzyme (酶) research and experts say they could be among the front-runners for a Nobel. Among the pair"s possible rivals are Frenchman Pierre Chambon and Americans Ronald Evans and Elwood Jensen, who opened up the field of studying proteins called nuclear hormone receptors (受体). As usual, the tight-lipped award committee is giving no hints about who is in the running before presenting its decision in a news conference at Stockholm"s Karolinska Institute. Alfred Nobel, the Swede who invented dynamite (炸药), established the prizes in his will in the categories of medicine, physics, chemistry, literature and peace. The economics prize is technically not a Nobel but a 1968 creation of Sweden"s central bank. Nobel left few instructions on how to select winners, but medicine winners are typically awarded for a specific breakthrough rather than a body of research. Hans Jornvall, secretary of the medicine prize committee, said the 10 million kronor (瑞典克朗) (US $1.3 million) prize encourages groundbreaking research but he did not think winning it was the primary goal for scientists. "Individual researchers probably don"t look at themselves as potential Nobel Prize winners when they"re at work," Jornvall told The Associated Press. "They get their kicks from their research and their interest in how life functions." In 2006, Blackburn, of the University of California, San Francisco, and Greider, of Johns Hopkins University in Baltimore, shared the Lasker prize for basic medical research with Jack Szostak of Harvard Medical School. Their work set the stage for research suggesting that cancer cells use telomerase (端粒酶) to sustain (维持) their uncontrolled growth.

单选题Smart Window Windows not only let light in to cut down an electricity use for lighting, but the light coming through the window also provides heat. However, windows are not something people typically associate with being a cutting edge technology. Researchers are now working on new technologies that enable a window to quickly change from clear to dark and anywhere in between with a flip of a switch. "It took us a long time to figure out what a window really is," says Claes Granqvist. He"s a professor of solid-state physics at Uppsala University in Sweden. "It"s contact with the outside world. You have to have visual contact with the surrounding world to feel well." So, windows and natural light are important for improving the way people feel when they"re stuck indoors. Yet, windows are the weak link in a building when it comes to energy and temperature control. In winter, cold air leaks in. When it"s hot and sunny, sunlight streams in. All of this sunlight carries lots of heat and energy. And all of this extra heat forces people to turn on their air conditioners. Producing blasts of cold air, which can feel so refreshing, actually suck up enormous amounts of electricity in buildings around the world. Windows have been a major focus of energy research for a long time. Over the years, scientists have come up with a variety of strategies for coating, glazing, and layering windows to make them more energy efficient. Smart windows go a step further. They use chromogenic technologies which involve changes of color. Electrochromic windows use electricity to change color. For example, a sheet of glass coated with thin layers of chemical compound such as tungsten oxide works a bit like a battery. Tungsten oxide is clear when an electric charge is applied and dark when the charge is removed, that is, when the amount of voltage is decreased, the window darkens until it"s completely dark after all electricity is taken away. So applying a voltage determines whether the window looks clear or dark. One important feature that makes a smart window so smart is that it has a sort of "memory". All it takes is a small jolt of voltage to turn the window from one state to the other. Then, it stays that way. Transitions take anywhere from 10 seconds to a few minutes, depending on the size of the window. The development of smart windows could mean that massive air conditioning systems may no longer need. "In the future," Granqvist says, "our buildings may look different."