【ThingslikeHulahoops（呼啦圈）usedtobeverypopular．Didyoueverownanyofthese？Ifyoudidn’t，don’tfeeltoobad．Theywereallfads．Afadissomethingthatbecomesvery（36）___amongalargenumberofpeople，butonlyfor】

　　Things like Hula hoops（呼啦圈）used to be very popular．Did you ever own any of these？If you didn’t，don’t feel too bad．They were all fads．A fad is something that becomes very（36）___among a large number of people，but only for a short time．（37）___ can become a fad very quickly，but can stop being popular just as quickly．（38）___it is no longer“cool，”a fad goes away．Anything can become a（n） （39）___-fashion，food，music，technology，even language．

　　In the late 1970s，Erno Rubik，a professor was looking for a （40）___way to teach his students about 3D objects．He （41）___a six-color plastic object that would be called the Rubik’s Cube（魔方）．The goal was to get each side of the cube a （42）___color．It was very challenging．It took a few years for the toy to become popular，but then （43）___，in 1982，it seemed everyone had one．People bought over a hundred million of the （44）___．There were 50books available that year offering solutions（解决办法）．Then，just as suddenly as the craze （风尚） started，it （45）___．By 1983，people were not interested in the Rubik’s Cube anymore，perhaps because so many people（46）___had one in their home．

　　In 2012，a South Korean musician named Psy released a song called“Gangnam （江南） Style．”The music video shows Psy pretending （假装） to horse-ride while he is dancing．In six months，it became the first Youtube （一视频网站） video ever to reach a billion views （观看）．Six months after that，（47）___went on to reach two billion views．The song and video started a worldwide （48）___craze．“Gangnam Style”had a huge influence on world popular culture．U．S．President Barack Obama and U．K．Prime Minister David Cameron even （49）___the dance．“Gangnam Style”became less and less popular，（50）___the“Korean Wave”of culture remains popular all over the world．

　　36．A．useful B．popular C．valuable D．relaxing

　　37．A．Both B．Someone C．Something D．None

　　38．A．Although B．Whether C．Before D．When

　　39．A．invention B．fad C．goal