下列属于我国期货中介与服务机构的有（　）。

   According to sociologists, there are several different ways in which a person may become recognized as the leader of a social group. In the family, traditional cultural patterns confer leadership on one or both of the parents. In other cases, such as friendship groups, one or more persons may gradually emerge as leaders, although there is no formal process of selection. In larger groups, leaders are usually chosen formally through election or recruitment.
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/    Although leaders are often thought to be people with unusual personal ability, decades of research have failed to produce consistent evidence that there is any category of "natural leaders". It seems that there is no set of personal qualities that all leaders have in common; rather, virtually any person may be recognized as a leader if the person has qualities that meet the needs of that particular group.
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/    Research suggests that there are typically two different leadership roles that are held by different individuals. Instrumental leadership is leadership that emphasizes the completion of tasks by a social group. Group members look to instrumental leaders to" get things done". Expressive leadership, on the other hand, is leadership that emphasizes the collective well-beings of a social group's members. Expressive leaders are less concerned with the overall goals of the group than with providing emotional support to group members and attempting to minimize tension and conflict among them.
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/    Instrumental leaders are likely to have a rather secondary relationship to other group members. They give others and may discipline group members whoinhibit (阻碍) attainment of the group's goals. Expressive leaders cultivate a more personal or primary relationship to others in the group. They offer sympathy when someone experiences difficulties and try to resolve issues that threaten to divide the group. As the difference in these two roles suggest,expressive leaders generally receive more personal affection from groupmembers; instrumental leaders, if they are successful in promoting group goals,may enjoy a more distant respect.

    One of the world's first video games,Tetris(俄罗斯方块 ), has turned thirty years old, and its brand is anything but old school.
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/But what's kept people swiping and clicking to ensure each row of blocks stays aligned and disappears into the virtual world since its development in 1984 Soviet Russia? A combination of new plat form sand an attracting psychological appeal.
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/    Maya Rogers, the CEO of Blue Planet Software, the sole agent of the Tetris brand, said the protection of the game'score over the last three decades has aided its longevity. As mobile and social become two of the largest sources for gaming these days, Tetris isn't showing any signs of losing its appeal. Currently appearing on over 50 different gaming platforms, from the 1983 Nintendo Entertainment System (NES) to smart phones,Tetris is sold on over 425 million mobile devices. More than 20 billion games of Tetris Battle have been played on Facebook, too. There's some thing psychologically entrancing about the game, that's kept people hooked through the years. "Play a game of Tetris," said Rogers, "and satisfy your craving to create order out of chaos." Plus, there's the added quality of playing Tetris and never feeling wholly fulfilled."There' s no correct move that you can make," said. Neubauer, a loyal player of the game who work as a senior analyst at Saibus Research, an independent research and advisory firm, "The quest for the perfect move never ends."
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/    Tom Stafford, a professor of cognitive development and psychology at Sheffield University in the U.K., says that Tetris has been around so long because it transports garners into a different realm when they play. "It's a world of perpetually generating uncompleted tasks," he said. As he's said in the past, too, "Tetris is the granddaddy of puzzle games like Candy Crush saga--the things that keep us puzzling away for hours, days and weeks.""Tetris is pure game: thereis no benefit to it, nothing to leam, no social or physical consequence,"he added. "It is almost completely pointless, but keeps us coming back for more."

    Students of economics are in revolt ( 造反 ) again.This year,65 groups of students from 30 countries established an International Student Initiative for Pluralism ( 多元化) in Economics. In not her subject do students express such organized dissatisfaction with their teaching. It seems, however, to little lasting effect. Temporality is inherent in student life: they don suits, collect their first salary and leave their complaints behind until the same complaints are rediscovered by a new group of19-year-olds with similar naive hopes of changing the world. Still, recurrent dissatisfaction among both students and employers suggests they have a point.
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/    One cause of the problem is not specific to economics. Modem universities prize research above teaching, to a degree that would astonish people outside the system, who imagine its primary purpose is to educate the young. In reality, teaching ability plays a bit role in university hiring and promotion decisions. Many academic staff regard teaching as a trouble that gets in the way of their "own" work. If most students were not having such a good time outside the classroom, they would be angrier than they are. They should be.
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/    Students demand for more pluralism in the economics curriculum is well made. Yet much of the" heterodox economics" the Manchester students suggest including is flaky, the creation of people with their own political agenda. Their professors reject the introduction of these alternative schemes.
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/    Yet teachers are mistaken in their conformity, to a single methodological approach—concluded in the claim that hastaken hold in the past four decades that approaches not based on rational choice foundations are unscientific or" not economics". The need is not so much to teach alternative paradigms of economics as to teach thatpragmatism, not paradigm, is the key to economic understanding.
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/    This eclecticism is reflected in the curriculum setting. The subject of economics is not a method of analysis but a set of problems--the problems that drew students to the subject in the first place. The proper scope of economics is any and all ideas that bear usefully on these topics: just as the proper scope of medicine is any and all therapies that help the patient.