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医学统计中常用的平均数有、、。

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中医学的基本特点概括起来就是___、_、_____三个基本特点。

Write about the following topic． In contrast to the mass enthusiasm for returning home for

Sport is ubiquitous． Sky TV has at least thirteen sports channels． Throughout the world there is a proliferation of newspapers and magazines totally dedicated to sport． Sports personalities have become cultural icons ， worshipped like movie － stars and sought after by sponsors and advertisers alike． Where sport was once for fun and amateurs， it is now the stuff of serious investment． Of course， sport has always mattered． But the point is that in the past sport knew its place． Now it invades areas of life where previously it had nopresence： fashion， showbiz， business． It is a worldwide obsession． What is it that makes sport so enjoyable for so many？ First， we seriously believe that sport is something we can all do， however badly or however well． Tens of thousands set off on the London and New York Marathons． Amateur football matches take place all over the world every weekend． Sport is a democratic activity． Second， sports stars are self－made people． Sport is dominated by athletes from ordinary backgrounds． This is why it is a classic means by which those from the poorest backgrounds can seek fame and fortune． Third， we enjoy watching sport because we like to see the supreme skill of those who act like gladiators in the modern arena． There is the excitement of not knowing who is going to win． No rock concert， no movie， no play can offer that kind of spontaneous uncertainty． This gut －wrenching experience can be shared with a crowd of fifty round a widescreen TV in a pub， or a thronging mass of 100，000 live in a stadium． The rise of sport has been accompanied by the growing prominence of sports stars． They have become public figures， hence in great demand for TV commercials． The rise of the sports star is mirrored by the rise of sports companies such as Nike and Adidas． “Sport probably does more to unify nations than any politician has ever been capable of”． So said Nelson Mandela． The only truly global occasions are the Olympics and World Cup， watched by thousands of millions across the world． These great sporting events bring together players and athletes from different races like no other． Not only that， but sport provides just about the only example of global democracy where the rich do not dominate on the contrary， Brazilians have long been supreme at football， the Kenyans at middle－distance running， and black Americans at boxing． However， there are signs of disquiet in this vast， global industry． The sheer volume of sport is reaching the bursting point for all but the most besotted fan． Overpaid tennis players and golfers fly endlessly in personal jets from one meaningless tournament to the next． Sport risks kelling itself through greed and over－exposure． The danger is that we will all become satiated and ultimately disillusioned． Questions 1 to 5 Complete the summary below with information from the passage ， using no more than three words for each blank．Sport is now enjoying popularity all over the world． Besides the entertaining quality， it has turned into a kind of （1）． Furthermore， the worldwide obsession to it leads to its （2） in many fields ． There are three points which can shed a light on its unique charm： it being a democratic activity， athletes from ordinary backgrounds， and audienceenjoying （3 ） that they can’t get from other kinds of entertainments ． More importantly， sport is playing a significant role in （4） and offering global democracy． However， this global industry will probably be confronted with audiences’ （5） __ due to its over－exposure．

When a professor gives students ______ instructions， the instructions are generally easily

A. clear－cut
B. blurry
C. marginal
D. ambiguous