完形填空（时间：10分钟）
Ero Carrera is watching the computer screen in a lab in California as he tracks a new computer virus slowly circling the globe, targeting cell phones. Working from the US office of the Finnish computer 21 firm, Carrera knows this virus could be the start of something big and 22 . He’s one of a couple of hundred “virus hunters” worldwide who guard computers and cell phones from 23 . That’s the job for these unlikely action heroes of the Internet age, where quick and curious minds are more important than strong 24 .
