Class means a person's economic position in society.A commonly used classification is lower class，middle class and upper class.While sociologists disagree on how these terms should be exactly defined，they do describe societies like the United States quite well.One study shows that 53% of Americans belong to the lower class,46% the middle class，and 1% the upper class.Interestingly，a surgeon earning $500,000 a year and a bus driver earning $50,000 a year both regard themselves as the middle class!

　　Power refers to the amount of control a person has over other people.Obviously，people in positions of great power (such as governors) exercise(行使) big power，but people who take orders from others have less power.Power and class do not always go hand in hand，however.For example，the governor of a state has great power，but he or she may not belong to a corresponding(相应的) economic class.Generally，however，there is a relationship between power and class.To our knowledge，there aren't too many people who aren't millionaires in the U．S.Senate!

　　Status is the honor or respect attached to a person's position in society.It can also be affected by power and class，but not necessarily so.For example，a university professor may have a high status but not belong to a high social class or have a lot of power over others.

　　Which of the following shows the structure of the whole text?

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