OnOctober 12, 1989, someChinesescientistswereworkingatthecomputerstolookforinformationtheyneeded. Suddenlytheysawalotofverybrightspotscrossingthecomputerssscreens. Atthesametimethecomputerswereworkingmuchslower. Tofindoutwhatwashappeningtheystoppedtheirworktochecksomepartsofthecomputers. Totheirhorror, theyfoundoutthatmostoftheirstoredinformationwasgotridofbycomputerviruses （病毒）! Obviouslyallthesecomputershadbeeninfectedbycomputerviruses.
Itissaidthatthecomputervirusesweremadebyagroupofyoungmenfondofplayingtricks. Theyallhadexcellenteducation. Theycreatedthevirusesjusttoshowtheirintelligence （才智）. ThesekindsofcomputervirusesarenamedJerusalem（耶路撒冷）Viruses. Thesevirusescanstayincomputersforalongtime. Whenthetimecomestheywillattackthecomputersbyloweringthefunctions （功能）, damagingtheirnormalprogramsorevengettingridofalltheinformation.
WenowcometoknowthatJerusalemVirusesoftenattackcomputersonFridaysandthattheyarespreadingtoalotofcomputers. AmongthecountriesthatsufferedcomputerviruseslastyearareBritain, Australia, SwitzerlandandtheU.S. Butfillnow , howtogetridoftheterriblevirusesremainsaproblem.
56．Thegroupofyoungmencreatedtheviruseto________.
A. damagethecomputers
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