单选题The teacher couldn't Utolerate/U the boy's bad behaviour any longer.

单选题Red giant stars do not become white dwarf stars abruptly ; the process takes more than fifteen hundred years.

单选题Nowadays nearly everyone has suffered from a bad attack of forgetfulness when a password is needed. The company computer. The home computer. Banking and ATM machines. Websites. Car and home security systems. The list goes on. It does not take long to accumulate a dozen or more passwords. Scribbling them down on slips of paper or simply using the same password for anything and everything is how most people cope with the overload. The negative aspect of this is that either way makes it easier for hackers to invade computer privacy. Researchers are now trying to do something about this by moving forward what may be an answer to the password puzzle-pictures. What does the writer mainly talks about in the first three paragraphs?A. Why people are so forgetful in the computer era.B. what happens when many passwords are needed.C. Why hackers can easily invade computer privacy.D. What people usually do to solve the password puzzl

单选题下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题定1个最佳选项。{{B}}第一篇{{/B}} Doubts and Debates over the Worth of MBA Bill Gates, the billionaire Microsoft chairman without a single earned university degree, is by his success raising new doubts about the worth of the business world's favorite academic title: the MBA ( Master of Business Administration). The MBA, a 20th-century product always has borne the mark of lowly commerce and greed (贪婪) on the tree-lined campuses ruled by purer disciplines such as philosophy and literature. But even with the recession apparently cutting into the hiring of business school graduates, about 79,000 people are expected to receive MBAs in 1993. This is nearly 16 times the number of business graduates in 1960, a testimony to the widespread assumption that the MBA is vital for young men and women who want to run companies some day. "If you are going into the corporate world it is still a disadvantage not to have one," said Donald Morrison, professor of marketing and management science. "But in the last five years or so, when someone says, ' Should I attempt to get an MBA,' the answer a lot more is: It depends. " The success of Bill Gates and other non-MBAs, such as the late Sam Walton of Wal-Mart Stores Inc. has helped inspire self-conscious debates on business school campuses over the worth of a business degree and whether management skills can be taught. The Harvard Business Review printed a lively, fictional exchange of letters to dramatize complaints about business degree holders. The article called MBA hires "extremely disappointing" and said "MBAs wants to move up too fast, they don't understand politics and people, and they aren't able to function as part of a team until their third year. But by then, they're out looking for other jobs. " The problem, most participants in the debate acknowledge, is that the MBA has acquired an aura (光环) of future riches and power for beyond its actual importance and usefulness. Enrollment in business schools exploded in the 1970s and 1980s and created the assumption that no one who pursued a business career could do with out one. The growth was fueled by a backlash (反冲) against the anti-business values of the 1960s and by the women's movement. Business people who have hired or worked with MBAs say those with the degrees often know how to analyze systems but are not so skillful at motivating people. "They don't get a lot of grounding in the people side of the business," said James Shaffer, vice president and principal of the Towers Perrin management consulting firm.

单选题Good Table Manners Manners play an important part in making a favorable impression at the dinner table. Here are some general rules. Napkin (餐巾) use The meal begins when the host unfolds his or her napkin. This is your signal to do the same, so place your napkin on your lap. Unfold it completely if it is a small napkin, or in half, lengthwise (纵向地), if it is a large dinner napkin. If you need to leave the table during the meal, place your napkin on your chair as a signal to your server that you will be returning. Once the meal is over, place your napkin neatly on the table to the right of your dinner plate. Do not refold it. Use a napkin only for your mouth. Never use it for your nose, face or forehead. Use of utensils (餐具) Start with the knife, fork or spoon furthest from your plate, and work your way in, using one utensil for each course. If soup is served, remember to spoon away from yourself. This helps stop the drips. Do not put the entire soup spoon in your mouth. Instead, fill a soup spoon about 75 percent with soup, and sip (啜饮) it from the side noiselessly. After finishing dinner, place the knife and fork parallel to one another across the plate with the knife blade facing inward toward the plate. Using your fingers Here's a list of finger foods: sandwiches, cookies, small fruits or berries with stems, French fries and potato chips, and hamburgers. Chew (咀嚼) with your mouth closed and don't make noise; don't talk with your mouth full. Bread must be broken with your hands. It is never cut with a knife. Don't pick something out of your teeth. Instead, excuse yourself to the bathroom. If possible, try not to cough at the table. Do not put your elbows (肘) on the table. In France, it is essential to have both hands above the table at the same time. Do not put bones or anything else on the table. Things that are not eaten should be put on your plate.

单选题The new system was found more effective in document search than the _____.

单选题The (last) few weeks have been enjoyable．

单选题The two new studies, lead-authored by Professor Peter D. Loeb

单选题The U. S. faces severe economic problems.

单选题Cold air causes the arteries around the heart to constrict.

单选题The American Family In the American family the husband and wife usually share important decision making. When the children are 1 enough, they take part as well. Foreigners are often surprised by the permissiveness (宽容) of American parents. The old rule that "children should be seen and not heard" is rarely 2 , and children are often allowed to do 3 they wish without strict control of their parents. The father seldom expects his children to listen to him 4 question, and children are encouraged to be 5 at an early age. Some people believe that American parents carry this freedom 6 far. Others think that a strong father image would not 7 the American values of equality and independence. Because Americans emphasize the importance of independence, young people are expected to 8 their parental families by the time they have 9 their late teens or early twenties. Indeed, not to do so is often regarded as a 10 , a kind of weak dependence. This pattern of independence often results in serious 11 for the aging parents of a small family. The average American is expected to live 12 the age of 70. The job-retirement age is 13 65. The children have left home, married, and 14 their own households. At least 20 percent of all people over 65 do not have enough retirement incomes. 15 the major problem of many elderly couples is not economic. They feel useless and lonely with neither an occupation nor a close family group.

单选题I could recognize the old car at a Uglance/U.

单选题He is a physician. A．researcher B．professor C．doctor D．student

单选题Many scientists have been probing psychological problems.

单选题I've always been {{U}}cautious{{/U}} about giving people my phone number.

单选题The very north and south Uregions/U are covered with ice and snow.

单选题It hard for the young people to imagine what Usevere/U conditions their parents .once lived uder.

单选题The once barren hillsides are now good farmland.

单选题The writer suggests that you go to see a doctor when you feel you are losing your voice.

单选题Google's Gmail system, which serves millions of customers around the world, shut down yesterday. The problem may hurt its efforts to market applications which include e—mail to businesses. Google prides itself on the reliability of its software, at least according to its marketing pitch. It is not clear why Google had the problem. It keeps thousands of servers. Some of those may have developed trouble or some outside programmer, a hackea may have sent a bug into the system to make it collapse. What happened to Google yesterday?A. It lost millions of customers.B. Its Gmail system collapsed.C. Its market application program failed.D. Its servers were destroyed by hackers.