单选题Online dating, it"s now universally agreed, has its limits. In an effort to combat such digital deception tactics, one of the biggest online dating services, Match.com, has decided to get people out from behind their computers to come out and play. Ironic? No. Regular dating has its weaknesses too, including extreme initial awkwardness when two people first meet and the even extremer awkwardness of the next few hours when a date proves to be a nonstarter. Match. corn believes that with its database of single-but-searching folks, its algorithm (配对规则) for finding compatibility, it can put together a heck of a singles mixer. The company has been quietly inviting members to gatherings for the past few years so far, it has hosted about 60 singles events. After all, it knows where the singles are, and it knows what they say they like. So encouraged has Match been by the results, it has just launched an event service known as Stir, which will host 2,000 to 3,000 singles parties a year, hitting 24 cities in June and 70 in September. Since everyone at the events is looking for a date, the awkwardness is a shared burden and will be easier to shrug off, reasons the company. Also, the dating service is digging deep into its database of 3 million singles, so it can slice and dice the guest list. If it wanted to host a singles event on the south side of Topeka in which everybody was a single parent between the ages of 30 and 40 with an interest in Shar-Pei breeding, it could do that—all while making sure that the ratio of male to female dog lovers is perfectly balanced. Many companies have already tried to turn their online presence into a singles meet-up business. Match.com"s advantage here is the size of its singles pool and the depth of information it has about their preferences. Match"s VP of Strategy and Analytics Amarnath Thombre says the Stir meet-ups are not in response to recent studies that have questioned the effectiveness of compatibility algorithms such as the one Match.com offers but a natural area of development for a company that just wants to get people together. Nevertheless it seems to suggest that online dating might have found its natural limits; it cannot find a mathematical formula for chemistry. To say the dating company has high ambitions for Stir is an understatement. Match considers its foray into the offline world the biggest news in its 17 years of existence. "We will be the largest singles event company in the world," predicts Match. com president Mandy Ginsberg. "We could potentially serve half a million people a year." She also excited about stimulating local economies and revitalizing downtown areas by bringing customers to the local bars where the gatherings take place.

单选题A. goodB. bookC. lookD. too

单选题From the last three paragraphs we know that ______.

单选题The evolution of sex ratios has produced, in most plants and animals with separate sexes, approximately equal numbers of males and females. Why should this be so? Two main kinds of answers have been offered. One is couched in terms of advantage to population. It is argued that the sex ratio will evolve so as to maximize the number of meetings between individuals of the opposite sex. This is essentially a "group selection" argument. The other, and in my view correct, type of answer was first put forward by Fisher in 1930. This "genetic" argument starts from the assumption that genes can influence the relative numbers of male and female offspring produced by an individual carrying the genes. That sex ratio will be favored which maximizes the number of descendants an individual will have and hence the number of gene copies transmitted. Suppose that the population consisted mostly of females, then an individual who produced sons only would have more grandchildren. In contrast, if the population consisted mostly of males, it would pay to have daughters. If, however, the population consisted of equal numbers of males and females, sons and daughters would be equally valuable. Thus a one-to-one sex ratio is the only stable ratio; it is an "evolutionarily stable strategy". Although Fisher wrote before the mathematical theory of games had been developed, his theory incorporates the essential feature of a game that the best strategy to adopt depends on what others are doing. Since Fisher's time, it has been realized that genes can sometimes influence the chromosome or gamete in which they find themselves so that the gamete will be more likely to participate in fertilization. If such a gene occurs on a sex-determining(X or Y)chromo-some, then highly aberrant sex ratios can occur. But more immediately relevant to game theory are the sex ratios in certain parasitic wasp species that have a large excess of females. In these species, fertilized eggs develop into females and unfertilized eggs into males. A female stores sperm and can determine the sex of each egg she lays by fertilizing it or leaving it unfertilized. By Fisher's argument, it should still pay a female to produce equal numbers of sons and daughters. Hamilton, noting that the eggs develop within their host —the larva of another insect — and that the newly emerged adult wasps mate immediately and disperse, offered a remarkably cogent analysis. Since only one female usually eggs in a given larva, it would pay her to produce one male only, because this one could fertilize all his sisters on emergence. Like Fisher, Hamilton looked for an evolutionarily stable strategy, but he went a step further in recognizing that he was looking strategy.

单选题I would like to stay in the small town due to its______ weather.

单选题In many modem countries, children go to school ______.

单选题What is the expression "knock cheaters off stride" mean?

单选题She told her little brother ______ her hand tightly while they were crossing the busy street. A. hold on to B. holding on to C. held on to D. to hold on to

单选题It was a case of emergency. The four-year-old girl awoke and smelled smoke. She couldn"t wake her mother, so she dialed "zero". An operator immediately called the fire department. Help was sent, and a tragedy avoided. Days before this emergency, the mother had taught her child how to telephone for help. Children as young as two and one-half years old can be taught to use the phone in emergency situations. Here are some points. Memorizing some facts is important. Teach your children their names, and the section of town where you live. Try to keep what they learn within their abilities. Simple information, learned well, is better than difficult information only partly learned. Be sure your children know how to use the telephone. They should be taught to dial "zero" for the operator, at the very least. And they should be taught to dial "911" if it is used in your town. Practise over a period of several days. Over-learning is necessary so the child can act automatically in case of emergency. If you would like a booklet giving instructions on calling for help, write Telephone for Help, Box 99, Bowling Green Station, New York, NY 10004.

单选题Directions: There are 10 blanks in the following passage. For each numbered blank, there are four choices marked A, B, C and D. Choose the best one and mark your answer on the ANSWER SHEET with a single line through the center. Our planet is like a bit spaceship. Our atmosphere acts {{U}}(51) {{/U}} a shield against harmful radiation and space debris. {{U}}(52) {{/U}} holds the air and people on the spaceship, {{U}}(53) {{/U}} everything doesn't float away. Each of us is an astronaut and our spaceship, the earth, provides our food and water. The sun is our energy {{U}}(54) {{/U}} and without it we would not be able to survive. {{U}} (55) {{/U}} every spaceship, the earth is a closed system. The only thing we receive from the outside is energy from the sun. Everything else must be used {{U}}(56) {{/U}} again. We astronauts don't seem to realize that this spaceship is the {{U}}(57) {{/U}} one we've got. We {{U}}(58) {{/U}} its resources and waste the energy the plants have stored from the sun. If we {{U}}(59) {{/U}} our spaceship, we will destroy ourselves as well. Maybe if we look at the universe which surrounds us, we will appreciate our own spaceship more and take {{U}}(60) {{/U}} care of it.

单选题Little John caught a (n) ( ) fish this morning.

单选题A study of art history might be a good way to learn more about a culture than is possible to learn in general history classes. Most typical history courses concentrate on politics, economics and war. But art history focuses on much more than this because art reflects not only the political values of a people, but also religious beliefs, emotions and psychology. In addition, information about the daily activities of our ancestors can be provided by art. In short, art expresses the essential qualities of a time and a place, and a study of it clearly offers us a deeper understanding than can be found in most history books. In history books, objective information about the political life of a country is presented; that is, facts about politics are given, but opinions are not expressed. Art, on the other hand, is subjective (主观的): it reflects emotions and opinions. The great Spanish painter Francisco Goya was perhaps the first truly "political" artist. In his well-known painting The Third of May , 1808, he criticized the Spanish government for its abuse(滥用) of power over people. In the same way, art can reflect a culture"s religious beliefs. For hundreds of years in Europe, religious art had been almost the only type of art that existed. Churches and other religious buildings were filled with paintings that described people and stories from the Bible. Although most people couldn"t read, they could still understand the Bible stories in the pictures on church walls. By contrast, one of the main characteristics of art in the Middle East was (and still is) its absence of human and animal images. This reflects the Islamic belief that statues(雕像) are not holy.

单选题A ______ surgeon can be as dangerous as a recruit with a gun who does not know how to handle. A. professional B. negligent C. competent D. mellow

单选题 阅读下列短文，然后根据短文的内容从每小题的四个选择项中，选出最佳的一项。{{B}}A{{/B}} If we were asked exactly what we were doing a year ago, we should probably have to say that we could not remember. But if we had kept a book and had written on it an aceount(记录) of what we did each day, we should be able to give an answer to the question. It is the same in history. Many things have been forgotten because we do not have any written account of them. Sometimes people did keep a record of the most important happenings in their country, but often it was destroyed by fire or in a war. Sometimes there was never written record at all because the people of that time and place did not know how to write. For example, we know a good deal about the people who lived in China 4000 years ago, because they could write and leave written records for those who lived after them. But we know almost nothing about the people who lived even 200 years ago in central Africa, because they had not learned to write. Sometimes, of course, even if the people can not write, they may know something of the past. For most people can tell proudly what their fathers did in the past. This we may call "remembered history". Some of it has now been written down. It is not so exact or so valuable to us as written history is, because words are much more easily changed when used again and again in speech than when copied in writing. But where there are no written re- cords, such spoken stories are often very helpful.

单选题{{B}}Passage Three{{/B}} The computer has changed the way we work, team, communicate, and play; Virtually ewery kind of organization throughout the world conducts business with computers. Students, teachers, and research scientists use the computer as a learning tool. Millions of individuals and organizations communicate with one another over a network of computers called the Internet. Computer games entertain people of all ages. Almost all computers are electronic digital computers. They are electronic in their use of electric current(电流) to carry information. They are digital in. that they process information as units of electric charge representing numbers. The word digital means having to do with numbers. To enable a computer to process information that is not numerical — such as words, pictures, or sounds — the computer or some other &vice must first digitize: that information. A device digitizes information by translating it into charges that represent numbers. After the computer processes the digitized information by working with the charges, the computer or a device: connected to the computer translates its results hack into their original form. Thus, an artist might use a machine called a scanner to digitize a photograph. The artist would next process the resulting electric charges in a computer to Change the photograph perhaps to add a border. The artist would then use a printer connected to the computer to produce a, copy of the altered photo. Digital computers are one of two general kinds of computers. The other kind is calculating devices called analog computers. An analog computer represents amounts with physical quantities, such as distances along a scale, rather than with numbers.