Which one is necessary for the activity of respiratory center？

A、afferent signals from the pulmonary stretch receptor.

B、afferent signals from the proprioceptors in the respiratory muscle.

C、certain level of PCO2.

D、certain level of hypoxia.

E、certai level of H+

Which one is NOT the reason for the airtight security at the data center?

A.There are dangers posed by hackers.

B.There is only one Visa center in North America.

C.There is considerable growth in mobile purchases.

D.There are a large number of daily transactions processed here.

A、incidental, not intentional.

B、meaning focused, not form focused.

C、production based.

D、cyclical and parallel, not sequential and additive.

A、jogging

B、walking

C、bicycling

D、weight lifting

As to the World Trade Center, which of the following is NOT mentioned in the first paragraph?

A．It has altogether one hundred and four floors.

B．Construction workers are busy in building it.

C．Much concrete is used for the construction of it.

D．It is built on the spot where the old one was destroyed.

Energy Crisis

One key question for the next century is how we provide energy in an environmentally sound way.

As living standards rise in the developing world, energy consumption will increase. As a result, many countries are now opening the door for private investment in a sector that used once to be solely the preserve of government.

In the developed world, the move is towards the deregulation and privatization of electricity generation and distribution. There is also a trend towards locally-generated energy, particularly in the developing world. Factories and shopping centers may one day have their own power sources.

Progress is also being made in minimizing the environmental impact of energy production and consumption. A motor car today puts out perhaps 5 percent of the pollution a new car did in 1970. We can produce clean power too but it costs, so in the new millennium(一千年) we're to some extent going to have the environment we can afford.

The spectre of scarce or impossibly expensive energy is no longer with us, thanks to a combination of opening up new regions of the world and new technologies. Shortage is very unlikely. Environmental considerations mean there is a seriousness too about alternative energy sources that wasn't there ten years ago.

Right now the fuel cell is at the top of the list of alternative technologies. Advances in turbine transportation mean that natural gas is going to have an ever-increasing role. Nuclear power may prove competitive enough to have a much longer life than many expect, but until there's a major change in public sentiment, I don't expect to see much new nuclear construction.

Will the grip of oil on personal transportation continue? Sports utility vehicles like Land Rovers and jeeps are hardly the perfect means of urban transport. But people have become very attached to their automobiles. So until we get around to technology where we beam ourselves around, I suspect we'll continue to have them. Some may be electric; others could run on cleaner oil-based fuel or natural gas.

One area which is certainly not clear is the impact of the internet on transport. On the one hand, you will be able to accomplish by sitting in front of a screen what you used to have to go to the airport for, on the otherhand, increased knowledge may well fuel a rising demand for travel. We are only at the beginning of a revolution that is already being called a bigger revolution than the internal combustion engine(内燃机).

Which of the following is true about the use of energy? ______

A．In the developing countries, there is a trend toward locally-generated energy.

B．In the developed world, clean power is used in motor cars.

C．A motorcar today puts out perhaps 5 times of the pollution a new car did in 1970.

D．Factories and shopping centers are able to have their own power sources.

Which one is NOT likely to be involved in normal hotels:

A.Health spas & fitness centers

B.Beauty salons & wellness treatment centers

C.Convalescent home

D.Children’s playrooms and assorted facilities

The role of and treatment of the housewife, which is really the major bone of contention in social security reform, has, of course, a major place in feminist thought. Betty Friedan’s book, The Feminine Mystique, which was influential in initiating the current wave of feminism in the United States, centered on the disadvantages to women of assuming the housewife ‘s role. All feminists believe that women should not be forced into assuming it, and that alternative choices should be available. Many feminists, such as the present writer, go further and believe that the disadvantages of the role of housewife are so great that it would be better if younger women were to avoid entering the role even temporarily and ff the "option" to assume the role were to disappear.

There is a second strand of feminist thought concerning housewives, which derives from the solidarity which feminists feel with all women, housewives included. This solidarity expresses itself in a concern to alleviate injuries (physical and psychological as well as financial) inflicted on housewives by their husbands and by the institutions of society. This second strand is not logically contradictory to the first; it is possible to love the sinner (the housewife herself) while hating the sin (playing the role). Nevertheless, the two strands do tend to cut different ways in terms of policy. Moreover, individual feminist thinkers differ in the emphasis they place on each.

These two strands of feminist thought inspire two kinds of complaints against the social security system -- that some housewives are treated too well and that some housewives are treated not well enough. The housewives who are treated too well are those married to retired men, who are enabled by the system to live at a higher standard than retired working wives whose family had comparable total covered earnings. The housewives who are treated not well enough are those whose dignity is scanted by treatment as a dependent, or those whose marriages end, and whose husbands retain all rights to social security (and private pensions) earned during the marriage.

The solidarity-with-housewives strand of feminist thought results in attitudes which emphasize the housewife's productiveness and give dignity to the position of housewife. It results in policy suggestions which would have the effect of making the woman who becomes and remains a housewife safer, more comfortable, less subject to financial shipwreck, more able to hold up her head as a productive member of society. The most characteristic product of this line of thought is the suggestion that housewives be awarded social security credits for the homemaking work they do. Some credit schemes would require the household to pay taxes in return for the credit; others would not. One merit of homemaker credits in the eyes of the solidarity-with-housewives advocates is that it makes housework and "paid work" more dike, thereby raising the status of house work psychologically and financially. A second merit, of course, is that in the case of divorce the homemaker would keep her credits, and thus would be more financially independent that is the case now.

The author advocates that women ______.

A．should not assume the roles of housewives at all.

B．men should share homemaking with their wives

C．no other roles should be offered to women than being housewives

D．women should assume the roles of housewives only temporarily

The role of and treatment of the housewife, which is really the major bone of contention in social security reform, has, of course, a major place in feminist thought. Betty Friedan's book, The Feminine Mystique, which was influential in initiating the current wave of feminism in the United States, centered on the disadvantages to women of assuming the housewife's role. All feminists believe that women should not be forced into assuming it, and that alternative choices should be available. Many feminists, such as the present writer, go further and believe that the disadvantages of the role of housewife are so great that it would be better if younger women were to avoid entering the role even temporarily and if the "option" to assume the role were to disappear.

There is a second strand of feminist thought concerning housewives, which derives from the solidarity which feminists feel with all women, housewives included. This solidarity expresses itself in a concern to alleviate injuries (physical and psychological as well as financial) inflicted on housewives by their husbands and by the institutions of society. This second strand is not logically contradictory to the first; it is possible to love the sinner (the housewife herself) while hating the sin (playing the role). Nevertheless, the two strands do tend to cut different ways in terms of policy. Moreover, individual, feminist thinkers differ in the emphasis they place on each.

These two strands of feminist thought inspire two kinds of complaints against the social security system -- that some housewives are treated too well and that some housewives are treated not well enough. The housewives who are treated too well are those married to retired men, who are enabled by the system to live at a higher standard than retired working wives whose family had comparable total covered earnings. The housewives who are treated not well enough are those whose dignity is scanted by treatment as a dependent, or those whose marriages end, and whose husbands retain all rights to social security (and private pensions) earned during the marriage.

The solidarity-with-housewives strand of feminist thought results in attitudes which emphasize the housewife's productiveness and give dignity to the position of housewife. It results in policy suggestions which would have the effect of making the woman who becomes and remains a housewife safer, more comfortable, less subject to financial shipwreck, more able to hold up her head as a productive member of society. The most characteristic product of this line of thought is the suggestion that housewives be awarded social security credits for the homemaking work they do. Some credit schemes would require the household to pay taxes in return for the credit; others would not. One merit of homemaker credits in the eyes of the solidarity-with-housewives advocates is that it makes housework and "paid work' more alike, thereby raising the status of housework psychologically and financially. A second merit, of course, is that in the case of divorce the homemaker would keep her credits, and thus would be more financially independent that is the case now.

The author advocates that women ______.

A．should not assume the roles of housewives at all

B．men should share homemaking with their wives

C．no other roles should be offered to women than being housewives

D．women should assume the roles of housewives only temporarily