单选题______ whether he will come or not. A. There is no telling B. There is not telling C. There is telling not D. There is not to tell

单选题A tyre ______ when you pump air into it; it shrinks when the air is gone.

单选题《复合题被拆开情况》 Bus drivers must have a commercial 商业的 driver’s license CDL. This can sometimes be earned during on-the-job training. They must possess a clean driving record and may be required to pass a

单选题Two hundred dollars ______a large sum of money to the old man. A. is B. is to be C. are D. are to be

单选题 Educators today are more and more often heard to say that computer literacy is absolutely necessary for college students. Many even argue that each incoming freshman should have permanent access to his or her own microcomputer. What advantages do computers offer the college students? Any student who has used a word processor will know one compelling reason to use a computer: to write papers. Although not all students feel comfortable composing on a word processor, most find revising and editing much easier on it. One can alter, insert, or delete just by pressing a few keys, thus eliminating the need to rewrite or re-type. Furthermore, since the revision process is less burdensome, students are more likely to revise as often as is necessary to end up with the best paper possible. For these reasons, many freshman English courses require the use of a word processor. Computers are also useful in the context of language courses, where they are used to drill students in basic skills. Software programs reinforce ESL(English as a Second Language) instruction, as well as instruction in French, German, Spanish, and other languages. By using these programs on a regular basis, students can improve their proficiency in a language while proceeding at their own pace. Science students take advantage of computers in many ways. Using computer graphic capabilities, for example, botany students can represent and analyze different plant growth patterns. Medical students can learn to interpret computerized images of internal body structures. Physics students can complete complex calculations far more quickly than they could without the use of computer. Similarly, business and accounting students find that computer spreadsheet programs are all but indispensable to many aspects of their work, while students pursuing careers in graphic arts, marketing, and public relations find that knowledge of computer graphic is important. Education majors learn to develop grading systems using computers, while social science students use computers for analyzing and graphically displacing their research results. It is no wonder, then, that educators support the purchase and use of microcomputers by students. A versatile tool, the computer can help students learn. And that is, after all, the reason for going to college.

单选题Most of the changes (occurred) in pattens of family planning (had taken place) before public family services were established and at (considerable) emotional and physical costs (to many couples).

单选题The police searched the building ______ but failed to find out where the bomb was. A. throughout B. fully C. altogether D. thoroughly

单选题Dina ,struggling for months to get a job as a waitress, finally took a ______at a local advertising agency.

单选题Many politicians find that they can no longer afford the luxury of a personal chauffeur.

单选题 I've always been an optimist and I suppose that is rooted in my belief that the power of creativity and intelligence can make the world a better place. For as long as I can remember, I've loved learning new things and solving problems. So when I sat down at a computer for the first time in seventh grade, I was hooked. It was an old teletype machine and it could barely do anything compared to the computers we have today. But it changed my life. Computers have transformed how we learn, giving kids everywhere a window into all of the world's knowledge. They're helping us build communities around the things we care about and to stay close to the people who are important to us, no matter where they are. Like my friend Warren Buffett, I feel particularly lucky to do something every day that I love to do. He calls it 'tap-dancing to work.' My job at Microsoft is as challenging as ever, but what makes me 'tap-dance to work' is when we show people something new, like a computer that can recognize your hand-writing or your speech, or one that can store a lifetime's worth of photos, and they say, 'I didn't know you could do that with a PC!' But for all the cool things that a person can do with a PC, there are lots of other ways we can put our creativity and intelligence to work to improve our world. There are still far too many people in the world whose most basic needs go unmet. Every year, for example, millions of people die from diseases that are easy to prevent or treat in the developed world. I believe that my own good fortune brings with it a responsibility to give back to the world. As a father, I believe that the death of a child in Africa is no less poignant or tragic than the death of a child anywhere else. And that it doesn't take much to make an immense difference in these children's lives. I'm still very much an optimist, and I believe that progress on even the world's toughest problems is possible—and it's happening every day. We're seeing new drugs for deadly diseases, new diagnostic tools, and new attention paid to the health problems in the developing world. I'm excited by the possibilities I see for medicine, for education and, of course, for technology. And I believe that through our natural inventiveness, creativity and willingness to solve tough problems, we're going to make some amazing achievements in all these areas in my lifetime.

单选题We don"t have beds in the spacecraft, but we do have sleeping bags. During the day, when we are working, we leave the bags tied to the wall, out of the way. At bedtime we untie them and take them wherever we"ve chosen to sleep. On most spacecraft flights everyone sleeps at the same time. No one has to stay awake to watch over the spacecraft; the craft"s computers call us on the radio. On the spacecraft, sleep-time doesn"t mean nighttime. During each ninety-minute orbit (轨道) the sun "rises" and shines through our windows for about fifty minutes, then it "sets" as the spacecraft takes us around the dark side of the Earth. To keep the sun out of our eyes, we wear black sleep masks. It is surprisingly easy to get comfortable and fall asleep in space. Every astronaut (宇航员) sleeps differently : some sleep upside down, some sideways, and some right side up. When it"s time to sleep, I take my bag, my sleep mask and my tape player with earphones and float (漂浮) up to the flight deck (驾驶舱). Then I get into the bag, and float in a sitting position just above a seat, right next to a window. Before I pull the mask down over my eyes, I relax for a while, listening to music and watching the Earth go by under me.

单选题What are European views on the death penalty, according to the authors?

单选题The beauty of the Huangshan Mountain is ______ I can describe in words. A. more than B. not any more than C. no more than D. more rather than

单选题If the salesmen are not given Utangible/U benefits for a high volume of sales, they will loose their motivation.

单选题According to the passage, all of the following are the causes for the population explosion in China except ______.

单选题The composition is very good __________a few spelling mistakes.

单选题One of the strongest hurricanes __ was the Florida Keys Storm of 1935, during which 500 people were killed.

单选题It has been quite a long time ______the two companies established a business relationship.

单选题What is Valencia famous for?

单选题The poetry of Mallarme, like the poetry of most of the symbolists, is not clear and easily accessible but rather vague and