单选题Today's film makers emphasize special effects at the expense of the story.

单选题The manchineel tree has smooth, pale brown bark and long, {{U}}drooping{{/U}} branches.

单选题They decided to abandon the saving plan after discussion.A. give outB. give upC. give inD. give off

单选题The chairman Uproposed/U that we stop the meeting.

单选题Acknowledged as the main cause of hay fever the pollen of ragweed is very bothersome .

单选题What are my chances of promotion if I stay here?A. retirementB. replacementC. advertisementD. advancement

单选题When doves are about two weeks old, they are covered with grey feathers and are ready to try their wings.A. growB. wrapC. hideD. test

单选题Electric Backpack Backpacks are convenient. They can hold your books, your lunch, and a change of clothes, leaving your hands free to do other things. Someday, if you don't mind carrying a heavy load, your backpacks might also power your MP3 player, keep your cell phone running, and maybe even light your way home. Lawrence C. Rome and his colleagues from the University of Pennsylvania in Philadelphia and the Marine Biological Laboratory in Woods Hole, Mass, have invented a backpack that makes electricity from energy produced while its wearer walks. In military actions, search-and-rescue operations, and scientific field studies, people rely increasingly on cell phones, global positioning system (GPS) receivers, night-vision goggles, and other battery-powered devices to get around and do their work. The backpack's electricity-generating feature could dramatically reduce the amount of a wearer's load now devoted to spare batteries, report Rome and his colleagues in the Sept. 9, Science. The backpack's electricity-creating powers depend on springs used to hang a cloth pack from its metal frame. The frame sits against the wearer's back, and the whole pack moves up and down as the person walks. A gear mechanism converts vertical movements of the pack to rotary motions of an electrical generator, producing up to 7.4 watts. Unexpectedly, tests showed that wearers of the new backpack alter their gaits in response to the pack's oscillations, so that they carry loads more comfortably and with less effort than they do ordinary backpacks. Because of that surprising advantage, Rome plans to commercialize both electric and non-electric versions of the backpack. The backpack could be especially useful for soldiers, scientists, mountaineers, and emergency workers who typically carry heavy backpacks. For the rest of us, power-generating backpacks could make it possible to walk, play video games, watch TV, and listen to music, all at the same time. Electricity-generating packs aren't on the market yet, but if you do get one eventually, ~ust make sure to look both ways before crossing the street!

单选题It might be more prudent to get a second opinion before going ahead.

单选题The latest car model Uembodies/U many new improvements.

单选题Our New York branch is dealing with the matter. ______

单选题weather is a constant (subject) of conversation inBritain.

单选题Data Insecurity It never rains but it pours. Just as bosses and boards have finally sorted out their worst accounting and compliance troubles, and improved their feeble corporation governance, a new problem threatens to earn them, especially in America, the sort of nasty headlines that inevitably lead to heads rolling in the executive suite: data insecurity. Left, until now, to odd, low-level IT staff to put right, and seen as a concern only of data-rich industries such as banking, telecoms and air travel, information protection is now high on the boss"s agenda in businesses of every variety. Several massive leakages of customer and employee data this year—from organizations as diverse as Time Warner, the American defense contractor Science Applications International Corp and even the University of California, Berkeley have left managers hurriedly peering into their intricate IT systems and business processes in search of potential vulnerabilities. "Data is becoming an asset which needs to be guarded as much as any other asset," says Haim Mendelson of Stanford University"s business school. "The ability to guard customer data is the key to market value, which the board is responsible for on behalf of shareholders." Indeed, just as there is the concept of Generally Accepted Accounting Principles (GAAP), perhaps it is time for GASP, Generally Accepted Security Practices, suggested Eli Noam of New York"s Columbia Business School. "Setting the proper investment level for security, redundancy, and recovery is a management issue, not a technical one," he says. The mystery is that this should come as a surprise to any boss. Surely it should be obvious to the dimmest executive that trust, that most valuable of economic assets, is easily destroyed and hugely expensive to restore and that few things are more likely to destroy trust than a company letting sensitive personal data get into the wrong hands. The current state of affairs may have been encouraged, though not justified by the lack of legal penalty (in America, but not Europe) for data leakage. Until California recently passed a law, American firms did not have to tell anyone, even the victim, when data went a-stray. That may change fast: lots of proposed data-security legislation is now doing the rounds in Washington, D.C. Meanwhile, the theft of information about some 40 million credit-card accounts in America, disclosed on June 17th, overshadowed a hugely important decision a day earlier by America"s Federal Trade Commission (FFC) that puts corporate America on notice that regulators will act if firms fail to provide adequate data security.

单选题The Constitution's vague nature has given it the flexibility to be adapted when circumstances change.A. impreciseB. conciseC. unpolishedD. elementary

单选题The train came to {{U}}an abrupt{{/U}} stop, making us wonder where we were.

单选题Mary looked pale and {{U}}weary{{/U}}. A. ill B. tired C. worried D. peaceful

单选题Snow Ranger The two things—snow and mountains—which are needed for a ski area are the two things that cause avalanches, large mass of snow and ice crushing down the side of a mountain—often called White Death. It was the threat of the avalanche and its record as a killer of man in the western mountains that created the snow ranger. He first started on avalanche control work in the winter of 1937—1938 at Aha, Utah, in Wasatch National Forest. This mountain valley was becoming well known to skiers. It was dangerous. In fact, more than 120 persons had lost their lives in 1936 and another 200 died in 1937 as a result of avalanches before it became a major ski area. Thus, development of Aha and other major ski resorts in the west was dependent upon controlling the avalanche. The Forest Service set out to do it, and did, with its corps of snow rangers. It takes many things to make a snow ranger. The snow ranger must be in excellent physical condition. He must be a good skier and a skilled mountain climber. He should have at least a high school education, and the more college courses in geology, physics, and related fields he has, the better. He studies snow, terrain, wind and weather. He learns the conditions that produce avalanches. He learns to forecast avalanches and to bring them roaring on down the mountainsides to reduce their killing strength. The snow ranger learns to do this by using artillery, by blasting with TNT, and by the difficult and skillful art of skiing avalanches down. The snow ranger, dressed in a green parka which has a bright yellow shoulder patch, means safety for people on ski slopes. He pulls the trigger on a 75 mm. Recoilless rifle, skis waist deep in powder testing snow stability, or talks with the ski area's operator as he goes about his work to protect the public from the hazards of deep snow on steep mountain slopes.

单选题Did anyone call when I was out?

单选题Can you give me a concrete example to support your idea?

单选题If any man here does not agree with me, he should advance his own plan for improving the living conditions of these people.