题目内容：

    Outside， it's a cold winter's day． Inside a large shopping center， people are hanging around． But then， without warning， a pop song starts to play loudly． A teenager boy walks lazily to the center of the open space， and dances crazily to the music． He's joined by two of his friends， then some of the old people． Within the space of a few seconds， more than sixty people are dancing to the music - all in time and all in step． At first， onlookers are baffled， then they start smiling and clapping． They now know what they're seeing： a flash mob （快闪）．

According to Wikipedia， the term "flash mob" was created by Bill Wasik， an editor at Harper's Magazine， in 2003． Within a year， the phrase had entered the Concise Oxford English Dictionary． Since then， hundreds - possibly thousands - of flash mobs have been carried out around the world， in almost every kind of public space imaginable!

Each flash mob has its own style， but most flash mobs follow a similar formula （方案）． Often， the organizers search for willing participants using social media． Instructions and dance moves are given through email or video download． There are usually several rehearsals （排练） before the big day．

While it's happening， a few lucky passers-by watch it live． Most people who watch it， however， will see it later online． Some of the most popular flash mobs on YouTube have been watched more than 10million times． A famous example is MP3Experiment Eight， a flash mob that took place in New York City in July 2011 with over 3，500 participants． This event differed from normal flash mobs in that much of it was completely silent - and there were no rehearsals．

Flash mobs provide the participants， onlookers and online viewers with a lot of enjoyment and pleasure． For this reason alone， they're a modern， popular art form that should be celebrated．

1.What does the underlined word "baffled" in Paragraph 1 mean？ ______

A.Excited． B.Puzzled．

C.Satisfied． D.Disappointed．

2.Why does the author mention the Concise Oxford English Dictionary？ ______

A.To argue against Bill Wasik．

B.To compare it with Wikipedia．

C.To explain the meaning of "flash mob"．

D.To show the rapid development of flash mobs．

3.What is special about MP3Experiment Eight？ ______

A.It was played online．

B.It was the earliest flash mob．

C.It was played with no sound．

D.It was most accepted by the audience．

4.What is the author's opinion on flash mobs？ ______

A.Supportive． B.Hopeless．

C.Uncaring． D.Doubtful．