For many years marine centrifuges were designed for （） operation, that is the machines were run for a period during which solids accumulated in the bowlThe machine was stopped when the accumulated solids began to impair its performance.

A . has been used B . have been used C . has used D . have used

A.5 B.10 C.20 D.15

听力原文： For many years, T-shins were simple short-sleeved undershirts for men and boys. T-shirts used to be of one color--white. And since they were mom under shirts, they were generally not seen. Today the T-shirt has become fashionable. It can be seen everywhere and on everyone. Women and little children wear T-shirts as teenagers, university students, and men from all walks of life. T-shirts are worn on playground, at the beach or in town. They can also be worn for work. Yet T-shirts remain relatively inexpensive and long wearing, a.s well as easy to care for. [29]Smart but comfortable and convenient to wear, they have be- come one of America's newest ideas of fashion. Although T-shirts are now available in a wide variety of bright materials and styles, [30]the most popular kind is the traditional cotton T-shirts with a slogan or picture printed on the front. As T-shirts are becoming more and more popular, [31]new designs are coming up all the time. (30) A．T-shirts feel soft and wash well. B．T-shirts are smart and comfortable. C．T-shirts go well with trousers. D．T-shirts are suitable for evening wear.

Today things have changed a lot. T-shirts has become colorful and fashionable. It can be seen al most everywhere and on everyone. Women and children wear T-shirts as well as teenagers, university students and men from all walks of life. T-shirts are worn on the playground, on the beach or in town. They can also be worn for work; Because the T-shirts are relatively inexpensive, smart, comfortable and convenient to wear, they have be come one of the newest ideas in fashion over the world. Although T-shirts are now available in a wide variety of bright materials and styles, the most popular kind is the traditional cotton T-shirts with a slogan or a picture printed on the front. A T-shirt may bear a single word, a popular phrase, pictures of sportsmen, or an advertisement. As T-shirts are becoming more and more popular, new designs are coming up all the time. When do people usually wear T-shirts？ A．When they take part in sports. B．When they watch a film. C．When they go shopping. D．When they read a hook.

M: Good morning. I hope I can answer your questions. W: Are people in rich countries happier than people in not-so-rich countries？ M: Well, I would say there is a relationship between national wealth and well-being. In other words, the economic wealth of a country does appear to reflect the overall well-being of its citizens. W: Does it mean that rich people in a country are happier than poor people？ M: In some poor Countries, satisfaction with one's financial situation does affect happiness. But once people are able to afford the basic necessities of life; having more money doesn't necessarily make them happier. W: What about rich places like Europe and United States？ Are income and happiness related？ M: Very little. Rich people are only slightly happier than the average citizen. W: I'm always wondering whether winning a lottery can bring happiness. M: Well, as a matter of fact, various studies show that lottery winners only get temporary joy. W: I guess wealth is like health. If you don't have your health or if you're extremely poor, you will be miserable. M: Yes, that's true. Happiness is wanting what we have rather than getting what we want. W: That's a nice way of putting it. In your opinion, do people become happier as their countries be come richer？ M: Well, if I take the case of the United States, from 1957 to 1996, the proportion of people who said that they were very happy declined from 35% to 30%. But during that same period, the average income per person in the United States doubled. W: So, you mean that a steady increase in a country's prosperity does not mean an increase in its people's happiness. M: That's right. What does the woman do？ A．A teacher of economics. B．A professor of studying happiness. C．A consultant on economic affairs. D．A specialist in political science.

A．Most nurses work long days. B．They don't treat patients for illness and injury. C．Caring for sick patients requires patience and concern. D．They are not dedicated.

A．unpleasant B．prohibited C．unethical D．worthless

A．acquainted B．informed C．enlightened D．acknowledged

A．love B．like C．hobby D．fun

A.successful big company． B.successful small company． C.successfuI smalI businesses．

A．Right B．Wrong C．Not mentioned

Molly Wilson (1) a dancer and a mother for many years when she (2) to sail round the world to raise money for charity. As a child she (3) as a ballet dancer, but at 15 she had grown too tall for classical ballet, so she (4) (A) a member of a pop dance team. She (5) , and (6) she had children she retired from show business to bring them (7) . They grew up, and when they were 18 they left home. She says, “When I decided to do the round-the-world race, my husband thought I was bored because the children had left home. He was also worried (8) I had never sailed (9) . I was not bored, but I (10) some people who told me about the race. They had taken part in it, but they had only done one section, say, from New Zealand to Australia. I wanted to do the whole ten-month journey.3” 1) A. is B. was C. has been 2) A. decidesB. decided C. had decided 3) A. had trained B. had been trained C. was trained 4) A. became B. had become C. has become 5) A. gets married B. got married C. had married 6) A. before B. when C. after 7) A. downB. up C. out 8) A. although B. however C. because 9) A. before B. ago C. since 10) A. met B. had met C. has meet

A.will be B.was C.was being D.have been

A．has done B．is to do C．is to be done D．is done

One example is New York University in Manhattan. The School of Continuing and Professional Studies began online classes in nineteen ninety-two. Its Virtual College has taught more than ten thousand students from across the United States and other countries. Last year, the School of Continuing and Professional Studies launched NYU Online. It offers NYU's first online programs to earn a bachelor's degree. Programs are offered in three areas: leadership and management, information systems management and social sciences. University officials say classes are highly interactive, where students communicate with each other and their teachers. Some classes require students to all log in at the same time so they can attend live lectures by a professor. Students can also ask questions and work together on team projects. The university says classes are taught by NYU professors who have been trained in online teaching. International students must take two admission tests before they can be accepted into the program. These are the SAT and the TOEFL. We will discuss these tests later in our series. The cost to attend NYU Online depends on how many classes a student takes. It can cost as much as fifteen thousand dollars a year. NYU offers no financial aid for international students in this program. You can get more details at nyu.edu. 1. When did New York University start its online classes？ A. In 1990 B. In 1998. C. In 1992. D. In 1982. 2. Which of the following is NOT included in the online programs offering a BA degree？ A. Information Systems Management. B. Finance and Economy. C. Leadership and Management. D. Social Sciences. 3. What can the students do in the online learning programs？ A. Communicate with each other and the teacher. B. Attend classes and lectures together. C. Ask questions and work together on team projects. D. Students are taught by NYU professors in the classroom. 4. International students can be accepted into the program after ________ . A. they take the SAT and the TOFEL B. they go to New York University C. they apply and log in D. two years in the United States 5. How much does the online learning program cost per year？ A. $15,000. B. $1,500. C. It depends. D. $5,000.

A．A.in case of B．B.because of C．C.as a result of D．D.in spite of

是 否

A．data B．criteria C．committees D．flags