It’s one of the world’s most celebrated theories - that it takes just six steps to link any two people on the planet. Person A w

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问题     It’s one of the world’s most celebrated theories - that it takes just six steps to link any two people on the planet. Person A would have danced at a ball with B, who once shared a flat with C who bought a bicycle from D... and so on. Now a few computer whizzes have put the theory to the test and found that it is true - almost. Rather than six degrees of separation, we are linked by 6.6. In other words, we really are just a handful of acquaintances away from the likes of Madonna and the Queen. Eric Horvitz, one of the Microsoft researchers who tested the theory using electronic messages, said he was shocked at the result.
    The concept of six degrees of separation came to public attention after an experiment in the Sixties, but is seen today as more of an urban legend. However, the Microsoft study shows that neither the growing population - nor advances in communication technology - have markedly changed the result. "What we’re seeing suggests there may be a social connectivity constant for humanity," he said. "People have had this suspicion that we are really close. But we are showing on a very large scale that this idea goes beyond folklore."
    The researchers studied the addresses of 30 billion instant messages sent through the Microsoft network in a single month in 2006. Two people were considered to be acquaintances - or separated by one degree - if they communicated with one another through the email-like system. Calculations showed the majority of users, or 78 per cent, could be connected by just 6.6 messages or steps.
    The phrase "six degrees of separation" came into usage after the 1960s study by academic Stanley Milgram. Milgram sent letters to a random selection of people in American cities, telling them that they were to pass the note to a certain stockbroker living in Boston if they knew him by name. If they did not, they were to pass the letter to someone they knew who they thought might have a better chance of being acquainted with him. The average number of times the letters had to be passed on to reach the broker was six, or 6.2 to be exact - and a new phrase was born.
    The concept was not a new one even then, and had been written about in the 1920s by Hungarian author Frigyes Karinthy. Karinthy said that any two individuals could be connected by at most five acquaintances.
    But after Milgram’s experiment the idea captured the world’s imagination, later spawning a play and film. In the 1993 film Six Degrees of Separation, based on the 1990 play of the same name, one of the characters said: "Six degrees of separation between us and everybody else on the planet." "The president of the United States, a gondolier in Venice, just fill in the names." "I am bound, you are bound, to everyone on this planet by a trail of six people." However, others claim we are not as well connected as we think, and that a few quality friendships are more important that a host of loose links. Barriers such as education, class and race mean the world is not as small as we might like to believe, it is argued.
In Paragraph 4 the writer implies that______.

选项 A、Milgram knew every one who participated in his experiment.
B、Milgram was a postman.
C、Milgram’s experiment failed.
D、The phrase "six degrees of separation" was created to represent the result of Milgram’s experiment.

答案D

解析 推理题。“Milgram”是定位关键词。文中指出他是随机发送的信件,所以他并不认识所有参与实验的人(排除A);文中提到他是一个“academic”学者,所以B说他是邮递员是干扰项;他的实验就是要证明六度分隔理论,而结果是这个名词由此诞生,所以实验是成功的(排除C)。
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