单选题Microwaves are ______.

单选题The sense relation which holds the pair of words guest—host is ______.

单选题______is a good form of exercise for both the old and the young.

单选题Because he is ______ , we cannot predict what course he will follow at any moment. A. incoherent B. quiet C. capricious D. harmful

单选题Because oriental ideas of woman's subordination to man prevailed in those days, she______to meet with men on an equal basis.

单选题Alison closed the door of her small flat and put down her briefcase. As usual, she had brought some work home from the travel agency. She wanted to have a quick bite to eat and then, after spending a few hours working, she was looking forward to watching television or listening to some music. She was just about to start preparing her dinner when there was a knock at the door. "Oh, no! Who on earth could that be?" she muttered to herself. She went to the door and opened it just wide enough to see who it was. A man of about sixty was standing there. It took her a moment before she realized who he was. He lived in the flat below. They had passed each other on the stairs once or twice, and had nodded to each other but never really spoken. "Uh, sorry to bother you, but.., uh. .. there's something I'd like to talk to you about," he mumbled. He had a long, thin face and two big front teeth that made him look rather like a rabbit. Alison hesitated, but then, opening the door wide, asked him to come in. It was then that she noticed the dog. She hated dogs--particularly big ones. This one was a very old, very fat bulldog. The man had already gone into her small living-room and, without being asked, had sat down on the sofa. The dog followed him in and climbed up on the sofa next to him, breathing heavily. She stared at it. It stared back. The man coughed. "Uh, do you mind if I smoke?" he asked. Before she could ask him not to, he had taken out a cigarette and lit it. "I'11 tell you why I've come. I...I hope you won't be offended but, well..." he began and then stopped. Suddenly his face went red. His whole body began to shake. Then another cough exploded from somewhere deep inside him. Still coughing, he took out a grey, dirty-looking handkerchief and spat into it. Afterwards he put the cigarette back into his mouth and inhaled deeply. As he did so, some ash fell on the carpet. The man looked around the room. He seemed to have forgotten what he wanted to say. Alison glanced at her watch and wondered when he would get to the point. She waited. "Nice place you've got here," he said at last.

单选题A number of students in this class ______ to Beijing once or twice. A. were B. have been C. is D. has been

单选题They lost their way in the forest, and ______ made matters worse was that night began to fall. A. it B. that C. which D. what

单选题Humans are social animals, and most of us 11 our relationships with family and friends. An emerging 12 of research suggests that relationships can keep us healthier. And a new study finds those social 13 may also help us live longer. This new study combined a large number of previous studies and concluded that a 14 of social interactions ranks right up with smoking and obesity 15 a risk factor for death. Researchers from Brigham Young University 16 148 studies with a total of some 300,000 participants, tracking their social relationships and 17 they survived to the end of their particular study, which averaged about seven years. "Those who scored higher on those measures of social relationships were 50 percent more likely to be 18 at that follow-up than people who scored low on those measures," said Professor Julianne Holt-Lunstad, one of the authors of the study. She pointed out several ways relationships can 19 our health. They can help us cope with stress. They can help us maintain healthy habits 20 eating well, exercising or seeing a doctor. And there"s increasing research that shows a direct but poorly-understood link between relationships and physiological processes in the body.

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

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

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 ______.