单选题As he was waiting downstairs, he suddenly heard a voice calling from ______.A. overB. aboveC. upD. upon

单选题Which of the following is NOT the reason that the man wanted to buy a stereo?

单选题Woman: Your dormitory room isn't very large, is it? Man: I can hardly turn around in it. Question: What does the man mean?

单选题Being a foreigner, Cad did not ______ to the joke. A. appreciate B. catch on C. laugh D. like

单选题Sometimes the biggest changes in society are the hardest to spot precisely because they are hiding in plain sight. It could well be that way with wireless communications. Something that people think of as just another technology is beginning to show signs of changing lives, culture, politics, cities, jobs, even marriages dramatically. In particular, it will usher in a new version of a very old idea: nomadism. Futurology is a dangerous business, and it is true that most of the important arguments about mobile communications at the moment are to do with technology or regulation—bandwidth, spectrum use and so on. Yet it is worth jumping ahead and wondering what the social effects will be, for two reasons. First, the broad technological future is pretty clear: there will be ever faster cellular networks, and many more gadgets to connect to these networks. Second, the social changes are already visible: parents on beaches waving at their children while typing furtively on their BlackBerrys; entrepreneurs discovering they don't need offices after all. Everybody is doing more on the move. Wireless technology is surely not just an easier-to-use phone. The car divided cities into work and home areas; wireless technology may mix them up again, with more people working in suburbs or living in city centers. Traffic patterns are beginning to change again: the rush hours at 9am and 5pm are giving way to more varied patterns, with people going backwards and forwards between the office, home and all sorts of other places throughout the day. Already, architects are redesigning offices and universities, more flexible spaces for meeting people, fewer private enclosures for sedentary work. Will it be a better life? In some ways, yes. Digital nomadism will liberate ever more knowledge workers from the cubicle prisons as depicted in Mr. Dilbert's cartoons. But the old tyranny of place could become a new tyranny of time, as nomads who are "always on" all too often end up— mentally—anywhere but here. As for friends and family, permanent mobile connectivity could have the same effect as nomadism: it might bring you much closer to family and friends, but it may make it harder to bring in outsiders. Sociologists fret about constant e-mailers and texters losing the everyday connections to casual acquaintances or strangers sitting next to them in the cafe or on the Bus. The same tools have another dark side, turning everybody into a fully equipped paparazzo. Some fitness clubs have started banning mobile phones near the treadmills and showers lest exercising people find themselves pictured, flabby and sweaty, on some website. As in the desert, so in the city: nomadism promises the heaven of new freedom, but it also signals the hell of constant surveillance by the tribe.

单选题According to the passage, we know it's better for the pregnant women ______.

单选题Mary had finished her homework ______ the time I got home. A. until B. at C. by D. when

单选题What is the author's purpose of writing the passage?

单选题Shewasstaringoutoverthelake,lostin_______.

单选题Vigorously challenged yet widely ignored, the theory had languished for half a century, primarily due to its lack of a______mechanism to support the hypothesis.

单选题As researchers on aging noted recently, no treatment on the market today has been proved to slow human aging. ______. Those findings suggest that caloric restriction could delay aging and increase longevity in humans, too.

单选题Even though we had been to her house several times before, we still did not remember ______.

单选题The journal published a series of articles that reviewed the prospects for a new era of "genetic medicine".

单选题There is more land in Australia than the government knows ______. A. what to do with B. how to do C. to do with it D. to do it

单选题These charming girls are the ______ of equal pay for men and women.

单选题Not until you talked with him ______ that he had made a serious mistake.

单选题The decline of traditional religion in the West has not removed the need for men and women to find a deeper meaning behind existence. Why is the world the way it is and how do we, as conscious individuals, fit into the great scheme? There is a growing feeling that science, especially what is known as the new physics, can provide answers where religion remains vague and faltering. Many people in search of a meaning to their lives are finding enlightenment in the revolutionary developments at the frontiers of science. Much to the bewilderment of professional scientists, quasi-religious cults are being formed around such unlikely topic as quantum physics, space-time relativity, black holes and the big bang. How can physics, with its reputation for cold precision and objective materialism, provide such fertile soil for the mystical? The truth is that the spirit of scientific enquiry has undergone a remarkable transformation over the past 50 years. The twin revolutions of the theory of relativity, with its space-warps and time-warps, and the quantum theory, which reveals the shadowy and unsubstantial nature of atoms, have demolished the classical image of a clockwork universe slavishly unfolding along a predetermined pathway. Replacing this sterile mechanism is a world full of shifting indeterminism and subtle interactions which have no counterpart in daily experience. To study the new physics is to embark on a journey of wonderment and paradox, to glimpse the universe in a novel perspective, in which subject and object, mind and matter, force and field, become intertwined. Even the creation of the universe itself has fallen within the province of scientific enquiry. The new cosmology provides, for the first time, a consistent picture of how all physical structures, including space and time, came to exist out of nothing. We are moving towards and understanding in which matter, force, order and creation are unified into a single descriptive theme. Many of us who work in fundamental physics are deeply impressed by the harmony and order which pervades the physical world. To me the laws of the universe, from quarks to quasars, dovetail together so felicitously that the impression there is something behind it all seems overwhelming. The laws of physics are so remarkably clever that they can surely only be a manifestation of genius.

单选题—I heard that some police didn' t allow suspects enough sleep to get so-called criminal evidence in America. —______? This certainly goes against the rule of law.

单选题The mysterious guest on the show is______the president of our university.