单选题For companies, the threat of drive-by hacking seems set to grow as software programs assisting hackers proliferate on the Internet.

单选题Some of the concerns surrounding Turkey's application to join the European Union, to be voted on by the EU's Council of Ministers on December 17th, are economic — in particular, the country's relative poverty. Its GDP per head is less than a third of the average for the 15 pre-2004 members of the EU. But it is not far off that of one of the ten new members which joined on May 1st 2004(Latvia), and it is much the same as those of two countries, Bulgaria and Romania, which this week concluded accession talks with the EU that could make them full members on January 1st 2007. Furthermore, the country's recent economic progress has been, according to Donald Johnston, the secretary-general of the OECD, " stunning". GDP in the second quarter of the year was 13. 4% higher than a year earlier, a rate of growth that no EU country comes close to matching. Turkey's inflation rate has just fallen into single figures for the first time since 1972, and this week the country reached agreement with the IMF on a new three-year, $ 10 billion economic programme that will, according to the IMF's managing director, Rodrigo Rato, "help Turkey... reduce inflation toward European levels, and enhance the economy's resilience". Resilience has not historically been the country's economic strong point. As recently as 2001, GDP fell by over 7% . It fell by more than 5% in 1994, and by just under 5% in 1999. Indeed, throughout the 1990s growth oscillated like an electrocardiogram recording a violent heart attack. This irregularity has been one of the main reasons(along with red tape and corruption)why the country has failed dismally to attract much-needed foreign direct investment. Its stock of such investment(as a percentage of GDP)is lower now than it was in the 1980s, and annual inflows have scarcely ever reached $ 1 billion(whereas Ireland attracted over $ 25 billion in 2003, as did Brazil in every year from 1998 to 2000). One deterrent to foreign investors is due to disappear on January 1st 2005. On that day, Turkey will take away the right of virtually every one of its citizens to call themselves a millionaire. Six noughts will be removed from the face value of the lira; one unit of the local currency will henceforth be worth what lm are now—ie, about 0. 53euro($ 0. 70). Goods will have to be priced in both the new and old lira for the whole of the year, but foreign bankers and investors can begin to look forward to a time in Turkey when they will no longer have to juggle mentally with indeterminate strings of zeros.

单选题The consumer______in recent years has led to an explosion of shopping center development in big cities like Beijing, Shanghai and Canton.(厦门大学2012年试题)

单选题The ______ of his profession do not permit him to do that.

单选题Statuses are marvelous human inventions that enable us to get along with one another and to determine where we "fit" in society. As we go about our everyday lives, we mentally attempt to place people in terms of their statuses. For example, we must judge whether the person in the library is a reader or a librarian, whether the telephone caller is a friend or a salesman, whether the unfamiliar person on our property is thief or a meter reader, and so on. The statuses we assume often vary with the people we encounter, and change throughout life. Most of us can, at very high speed, assume the statuses that various situations require. Much of social interaction consists of identifying and selecting among appropriate statuses and allowing other people to assume their statuses in relation to us. This means that we fit our actions to those of other people based on a constant mental process of appraisal and interpretation. Although some of us find the task more difficult than others, most of us perform it rather effortlessly. A status has been compared to ready-made clothes. Within certain limits, the buyer can choose style and fabric. But an American is not free to choose the costume of a Chinese peasant or that of a Hindu prince. We must choose from among the clothing presented by our society. Furthermore, our choice is limited to a size that will fit, as well as by our pocketbook. Having made a choice within these limits we can have certain alterations made, but apart from minor adjustments, we tend to be limited to what the stores have on their racks. Statuses too come ready made, and the range of choice among them is limited.

单选题People of all countries are expected to ______ the principles of the United Nations and defend the peace in the world.

单选题How about a glass of orange juice to______your thirst?

单选题During the construction of skyscrapers, cranes are used to______ building materials to the upper floors.(2011年四川大学考博试题)

单选题Language, culture, and personality may be considered ______ of each other in thought, but they are inseparable in fact.(2010年厦门大学考博试题)

单选题The role of American women______significantly from the time the nation was born, to the modern era of the 1950s and 1960s.

单选题The book gives a brief______off the course of his research up till now.

单选题According to the old-timers, on two occasions ______.

单选题The new law allows you to ______ payment if you think a bill is incorrect.

单选题Typically, these children of Democrats switched ______ and joined the Republican Party during the 1980s.

单选题 Valvular heart diseases are quite common, essentially resulting in impaired blood flow and were very difficult to treat. Some 30 years ago, it became possible to replace .diseased valves with prostheses to impose a greater control over blood flow. Early devices were of the mechanical variety, in which devices like ball-in-a-cage or tilting disc would be used to allow blood to flow under near-normal conditions. Although a few mechanical problems were encountered in the early days, the major difficulty lay with the tendency for any foreign material to initiate a blood clot. So, all valve recipients have to be given anticoagulant therapy. This is not particularly desirable for the patients, who may develop bleeding problems, and in any case is not always successful. Although good results are achieved with these valves, it was considered necessary to develop alternatives and the direction was that of natural tissues. It's not possible to transplant heart valves untreated because of rejection phenomena, but it became apparent that collagenous tissue could be cross-linked by glutaraldehyde and prepared in the form of a heart valve. Two sources of tissue were considered for this purpose, bovine pericardium ( collagenous tissue derived from the wall of a cow's heart) and porcine valves (heart valves taken from pigs) and the resulting "bioprosthetic valve" appeared to be very promising. It was particularly important that these patients didn't need anticoagulation. Unfortunately, these valves have not proved very durable, the cross-linked collagen suffering from slow calcification and deterioration so most of the replacement valves themselves need to be replaced within a decade. This would tend to suggest that the mechanical valves give superior performance, notwithstanding the anticoagulation problem, and a move back towards their use might have been expected. However, most of the valves in current use incorporate an alloy'( usually Stellite) forthe housing, and a carbon coated occuluder. The complex shapes of some of the housing have required combinations of casting and welding technologies to be used in their construction and serious problems have arisen with a valve design from one manufacturer, where a small number of catastrophic fractures have occurred within the housing. In patients where this valve has been used to treat aortic valve disease, this fracture is usually fatal and although the risks are small, the problem is important to the industry. Also, at a time when this dichotomy is exercising the minds of surgeons, scientists and regulatory bodies alike, the emergence of the disease BSE in cattle has placed even further restrictions on the use of animal tissue for this type of application and the whole question of prosthetic heart valves has been turned from a reasonable successful example of reconstructive implant surgery to a very confused area. This serves to highlight some of the very varied problems of facing the use of biomaterials.

单选题Many well-educated people don't believe that ______ will endanger freedom of speech.

单选题The book contained a large ______ of information.

单选题Her sadness was obvious, but she believed that her feeling of depression was______. (2004年清华大学考博试题)