When John and Victoria Falls arrived in New York City for one-year stay，they did not bring very many things with them.They had planned either to live in a furnished apartment or to buy used furniture.But they soon learned about a new system that more and more people are using.The renting of home furnishings（bed，tables，dishes，and so on）has become one of America's fastest growing businesses.
     What kinds of people rent their home furnishings instead of buying them？People who are international business or government officials，foreign students，airline workers，young married couples-people whose job or business may force them to move frequently from one city to another.They save a lot of trouble and the cost of moving their furniture each time.They simply rent new furniture when they reach their new homes.Young people with little money do not want to buy cheap furniture that they may soon dislike.They prefer to wait until they have enough money to buy furniture they really like.Meanwhile，they find they can rent better quality furniture than they could afford to buy.
     One family，who now have a large，beautiful home of their own，liked their rented furniture so much that they decided to keep renting it instead of buying new things.But usually people don't like to tell others about it.The idea of renting home furnishings is still quite new，and they are not sure what their neighbors might think.

“No man is an island，”wrote the poet John Donne several centuries ago.He was acknowledging one of our most distinctive characteristics：the fact that we are social animals whose behavior and personalities are shaped by the groups to which we belong.
Throughout life，most of our daily activities are performed in the company of others.Whether our purpose is working，playing，raising a family，learning，or simply relaxing，we usually pursue it in groups，even if the group is as small as two or three people.Out need for human contacts is not merely a practical one；it is a deep psychological need as well.If people are deprived of the company of others for prolonged periods，mental breakdown is the usual result.Even the Geneva Convention（日内瓦公约），an international agreement that regulates the treatment of prisoners of war，recognizes this need.It regards solitary（孤独的）imprisonment for more than thirty day as a cruel form of torture（折磨）.
In its strictest sense，a group is a collection of people interacting together in an orderly way on the basis of shared expectations about one another’s behavior.As result of this interaction，members feel a common sense of “belonging.”They distinguish members from nonmembers and expect certain kinds of behavior from outsiders.

“No man is an island，”wrote the poet John Donne several centuries ago.He was acknowledging one of our most distinctive characteristics：the fact that we are social animals whose behavior and personalities are shaped by the groups to which we belong.
Throughout life，most of our daily activities are performed in the company of others.Whether our purpose is working，playing，raising a family，learning，or simply relaxing，we usually pursue it in groups，even if the group is as small as two or three people.Out need for human contacts is not merely a practical one；it is a deep psychological need as well.If people are deprived of the company of others for prolonged periods，mental breakdown is the usual result.Even the Geneva Convention（日内瓦公约），an international agreement that regulates the treatment of prisoners of war，recognizes this need.It regards solitary（孤独的）imprisonment for more than thirty day as a cruel form of torture（折磨）.
In its strictest sense，a group is a collection of people interacting together in an orderly way on the basis of shared expectations about one another’s behavior.As result of this interaction，members feel a common sense of “belonging.”They distinguish members from nonmembers and expect certain kinds of behavior from outsiders.

“No man is an island，”wrote the poet John Donne several centuries ago.He was acknowledging one of our most distinctive characteristics：the fact that we are social animals whose behavior and personalities are shaped by the groups to which we belong.
Throughout life，most of our daily activities are performed in the company of others.Whether our purpose is working，playing，raising a family，learning，or simply relaxing，we usually pursue it in groups，even if the group is as small as two or three people.Out need for human contacts is not merely a practical one；it is a deep psychological need as well.If people are deprived of the company of others for prolonged periods，mental breakdown is the usual result.Even the Geneva Convention（日内瓦公约），an international agreement that regulates the treatment of prisoners of war，recognizes this need.It regards solitary（孤独的）imprisonment for more than thirty day as a cruel form of torture（折磨）.
In its strictest sense，a group is a collection of people interacting together in an orderly way on the basis of shared expectations about one another’s behavior.As result of this interaction，members feel a common sense of “belonging.”They distinguish members from nonmembers and expect certain kinds of behavior from outsiders.

“No man is an island，”wrote the poet John Donne several centuries ago.He was acknowledging one of our most distinctive characteristics：the fact that we are social animals whose behavior and personalities are shaped by the groups to which we belong.
Throughout life，most of our daily activities are performed in the company of others.Whether our purpose is working，playing，raising a family，learning，or simply relaxing，we usually pursue it in groups，even if the group is as small as two or three people.Out need for human contacts is not merely a practical one；it is a deep psychological need as well.If people are deprived of the company of others for prolonged periods，mental breakdown is the usual result.Even the Geneva Convention（日内瓦公约），an international agreement that regulates the treatment of prisoners of war，recognizes this need.It regards solitary（孤独的）imprisonment for more than thirty day as a cruel form of torture（折磨）.
In its strictest sense，a group is a collection of people interacting together in an orderly way on the basis of shared expectations about one another’s behavior.As result of this interaction，members feel a common sense of “belonging.”They distinguish members from nonmembers and expect certain kinds of behavior from outsiders.

假设一个磁盘有200个磁道，编号从0～199。当前磁头正在143道上服务，并且刚刚完成了125道的请求。如果寻道请求队列的顺序是86，147，91，177，94，150，102，175，130