15．When US'Duke University second-year student Christian Drappi sees someone using a Square （an electronic payment service） credit card reader，he pulls out his phone，takes a picture and uploads it to Twitter．"It kind of spreads like （41）K through Twitter，"said Drappi，who is a campus brand representative for Square．
Companies are （42）E using college campus brand representatives to spread the word about their products．These representatives often rely on word-of-mouth tools like social media to （43）H the company and any promotional events they host．
Though the brand representative is no stranger to the college marketing scene，social media are changing how these representatives （44）F with students of their same age and how effectively their message is communicated．Companies like Red Bull，Microsoft and Twitter all have campus representatives （45）B to spreading good news about the brand．
"Campus representatives approach students groups，local merchants and other prospective users to demonstrate how the card reader works and its advantages over （46）J machines．"Adam Bassett，who runs the Square U program said．
Cord Silverstein，executive vice president of interactive communications at the Raleigh advertising agency Capstrat，said，"Social media have made it easier than ever for college students to share opinions on a product with their friends．Someone's friend，someone they （47）I，like a student or a professor，these people are having much greater influence on what college students think，like and don't like，because they trust their opinions．"
When looking at representative （48）A，McCarthy，who heads the campus representative program for Square，said the company looks for（49）C students who are social-media understanding．"Three or four years ago，brand representatives on campus were a（n）（50）G idea．Now companies have them everywhere．There's only so much mindshare to capture．"McCathy emphasized．
| A．applications | B．devoted | C．easy-going | D．efficiently | E．increasingly | F．interact |
| G．fresh | H．publicize | I．respect | J．traditional | K．wildfire | |
