______ it is from Bristol to Glasgow!A、What long a wayB、What distanceC、How long wayD、Ho

HTML语言中，(41)为表单标记。

A．＜p＞…＜/p＞

B．＜tr＞…＜/tr＞

C．＜form＞…＜/from＞

D．＜br＞

设有关系R(A，B，C)和S(C，D)。与SQL语句Select A，B，D From R，S Where R．C=S．C等价的关系代数表达式是

A．σR．C=S．C(πA,B,D(R×S))

B．πA．B．D(σR．C =S．C(R×S))

C．σR．C=S．C((πA，BR)×(πDS))

D．σR．C=S．C(πD((πA，BR)×S))

设有关系R(A，B，C)和S(C，D)与SQL语句SELECT A，B，D FROM R，S WHERE R.C=S.C等价的关系代数表达式是

A．σR.C=S.C(πA,B,D(R×S))

B．πA,B,D(σR.C-S.C(R×S))

C．σR.C=S.C((πA,BR)×(πDS))

D．σR.C=S.C(πD((πA,BR)×S)

设有关系R(A,B,C)和S(C,D)。与SQL语句select A,B,D from R,S where R.C=S.C等价的关系代数表达式是______。

A．σR.C=S.C(πA,B,D(R×S))

B．πA,B,D(σR.C=S.C(R×S))

C．σR.C=S.C((πA,BR)×(πDS))

D．σR.C=S.C(πD(πA,BR)×S)

设有关系R(A，B，C)和S(C，D)。与SQL语句SELECT A，B，D FROM R， S WHERE R.C＝S.C等价的关系代数表达式是()。

A．OR.C=SC(ЛA,B,D(R×S))

B．ЛA,B,D(σR.C=SC(R×S))

C．σR.C=SC((ЛA,BR)×(ЛDS))

D．σR.C=SC(ЛD(ЛA,BR)×S))

设有关系R(A，B，C)和S(C，D)。与SQL语句SELECT A，B，D FROM R， S WHERE R．C=S．C等价的关系代数表达式是()。

A．σR.C=S.C(ЛA,B,D(R×S))

B．ЛA,B,D(σR.C=S.C(R×S))

C．σR.C=S.C((ЛA,BR)×(ЛDS))

D．σR.C=S.C(ЛD(ЛA,BR)×S))

请根据短文内容，回答题。

Public Relations

Public relations is a broad set of planned communications about the company, including publicity releases, designed to promote goodwill and a favorable image.＜br＞

Publicity then is part of public relations when it is initiated by the finn, usually in the__________(51) of press releases or press conferences. Since public relations involves communications with stockholders, financial analysts, government officials, and other noncustomer groups, it is usually__________ (52) outside the marketing department, perhaps as a staff department or outside consulting firm reporting to top management. This organizational placement can be a__________ (53) because the public relations department or consultant will likely not be in tune with marketing efforts. Poor communication and no coordination may be the __________(54). Although the basic purpose of public relations is to provide positive influence __________(55) the public image, this influence generally may be less than __________(56) provided by the other components of the public image mix.＜br＞

Publicity may be in the form. of news releases that have __________(57) overtones for the company initiated by the public relations department. Publicity on the other__________(58) should not be divorced from the department marketing as it can__________ (59) a useful adjunct to the regular advertising. __________(60), not all publicity is initiated by the firm; some can__________ (61) from an unfavorable press as a reaction to certain actions or lack of__________ (62) that are controversial or even downright ill-advised.＜br＞

The __________(63) we wish to emphasize is that a firm is deluding itself if it thinks its public relations function, whether within the company or an outside firm, can take __________(64)of public image problems and opportunities. Many factors impact on the public image. Many of these have to do with the way the__________ (65) does business, such as its product quality, the servicing and handling of complaints, etc.

__________ 查看材料

A.matter

B.form

C.system

D.direction

n Services (AD DS) domain. All servers run Windows Server 2008 R2. All client computers run Windows 7. You virtualize applications by using Microsoft Application Virtualization (App - V).You need to ensure tha t all users access virtualized applications from their local branch office, and allow for active upgrades.Which should you install in each branch office？（）

A.a server with the File Services role installed

B.a server with the Web Server (IIS) role installed

C.Microsoft System Center Configuration Manager 2007 R2

D.Microsoft System Center Application Virtualization Streaming Server

请根据短文内容，回答题。

Traffic Jams——No End in Sight

(1) Traffic congestion (拥堵) affects people throughout the world. Traffic jams cause smog in dozens of cities across both the developed and developing world. In the U. S., commuters (通勤人员 ) spend an average of a full working week each year sitting in traffic jams, according to the Texas Transportation Institute. While alternative ways of getting around are available, most people still choose their cars because they are looking for convenience, comfort and privacy.＜br＞

(2) The most promising technique for reducing city traffic is called congestion pricing, whereby cities charge a toll to enter certain parts of town at certain times of day. In theory, if the toll is high enough, some drivers will cancel their trips or go by bus or train. And in practice it seems to work: Singapore, London and Stockholm have reduced traffic and pollution in city centres thanks to congestion pricing.＜br＞

(3) Another way to reduce rush-hour traffic is for employers to implement flextime, which lets employees travel to and from work at off-peak traffic times to avoid the rush hour. Those who have to travel during busy times can do their part by sharing cars. Employers can also allow more staff to telecommute (work from home) so as to keep more cars off the road altogether.＜br＞

(4) Some urban planners still believe that the best way to ease traffic congestion is to build more roads, especially roads that can take drivers around or over crowded city streets. But such techniques do not really keep cars off the road; they only accommodate more of them.＜br＞

(5) Other, more forward-thinking, planners know that more and more drivers and cars are taking to the roads every day, and they are unwilling to encourage more private automobiles when public transport is so much better both for people and the environment. For this reason, the American government has decided to spend some $7 billion on helping to increase capacity on public-transportsystemsandupgradethemwithmoreefficienttechnologies.But＜br＞

environmentalists complain that such funding is tiny compared with the $50 billion being spent on roads and bridges.

Paragraph 1 __________ 查看材料

A.Paying to get in

B.Changing work practice

C.Not doing enough

D.A solution which is no solution

E.Closing city centres to traffic

F.A global problem

请根据短文的内容，回答题。

Some Unusual Celebrations

Some holidays are well-known all around the world. Among them are New Year&39;s Eve celebrations.＜br＞

Also common are days in honor of love and friendship, like Valentine&39;s Day. Each country has its own special holidays, too, often to mark important events in its history. Schools, banks, and government offices all close on days like these. __________ (46) A few of them are really very strange.＜br＞

Of course, they are not strange to the people who celebrate them. Perhaps that is because the celebrations have long traditions. Consider April Fool&39;s Day, for example. No one knows when or why it began. Today it is celebrated in many countries- France, England, and Australia, among others. On this day, people play practical jokes. __________ (47) The ones who laugh are the ones playing the jokes. The people they fool often get angry. Does celebrating this day make sense to you？＜br＞

Day in Poland seems strange, too. On this day, it is traditional for boys to pour water over the heads of girls. Here is the strangest part: They do it to girls they like. Other unusual celebrations take place in a single city or town. A holiday called La Tomatina is celebrated in Bunol, Spain. Every year, in late August, big trucks carry more than 200,000 pounds of tomatoes into this little town. __________ (48)＜br＞

For two hours, people in the streets throw tomatoes at each other. Everyone ends up red from head to toe.＜br＞

August 10 marks the start of the Puck Fair, an Irish festival with a very unusual tradition. People from the town of Killorglin go up into the mountains and catch a wild goat. __________ (49)＜br＞

There are also some celebrations that are really strange. In the United States, sometimes one person gets an idea for a new holiday and tries to get others to accept it. Whose idea was Public Sleeping Day？ That one is on February 28. It may seem strange, but it sounds like more fun than the one on February 9. __________ (50)＜br＞

Do you like the idea of inventing a new holiday？ If you do, then you will want to mark March 26 on your calendar. That is Make Up Your Own Holiday Day.

第46题__________ 查看材料

A.They bring him back to town， put a crown on his head， and make him king for three days.

B.Some of the days people celebrate， however， are less serious.

C.That is supposed to be Toothache Day.

D.Then begins the world"s biggest food fight.

E.Some people have fun imagining new holidays.

F.Jokes are supposed to be funny， but these jokes do not make everyone laugh.

请根据短文的内容，回答题。

The Building of the Pyramids

The oldest stone buildings in the world are the pyramids. They have stood for nearly 5,000 years, and it seems like that __________ (46). There are over eighty of them scattered along the banks of the Nile, some of which are different in shape from the true pyramids. The most famous of these are the "Step" pyramid and the "Bent" pyramid.＜br＞

Some of the pyramids still look much the same as they must have done when they were built thousands of years ago. Most of the damage suffered by the others has been at the hands of men who were looking for treasure or, more often, __________ (47). The dry climate of Egypt has helped to preserve the pyramids, and their very shape __________ (48). These are good reasons why they can still be seen today, but perhaps the most important is that they were planned to last for ever.＜br＞

It is practically certain that plans were made for the building of the pyramids __________ (49).＜br＞

However, there are no writings or pictures to show us how the Egyptians planned or built the pyramids themselves. Consequently, we are only able to guess at the methods used. Nevertheless,by examining the actual pyramids and various tools which have been found, archaeologists have formed a fairly clear picture of them.＜br＞

One thing is certain: there must have been months of careful planning __________ (50). The first thing they had to do was to choose a suitable place. You may think this would have been easy with miles and miles of empty desert around, but a pyramid could not be built just anywhere.＜br＞

Certain rules had to be followed, and certain problems had to be overcome.＜

第46题___________ 查看材料

A.for stone to use in modem buildings

B.has made them less likely to fall into ruin

C.before they could begin to build

D.because the plans of other large works have fortunately been preserved

E.while building the pyramids

F.they will continue to stand for thousands of years yet