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1、第三节题组训练2科普知识A（2017・河东区一模）Doyoueverwishforalittlemoretimetodoeverythingyouneedtodo?Well,onJuly1you，11begettingit一butonlyonemoresecond.OnJuly1atexactly7：59：59a.m.Beijingtime（oronJune30at23：59：59UTC,CoordinatedUniversalTime）,theworld，satomic（原子白勺）clockswi11pausef
2、orasinglesecond,or,moreprecisely,changetotheunusualtimeof7：59：60,accordingtotheverge,com.Theadditionofaleapsecond。闰秒）,announcedbytheParisObservatory,istokeepourclocksintimewiththeslowingofEarth"srotation（旋转）andastronomicaltimeasmeasuredbythesun.Justoneextrasec
3、ondcouldcausebigproblemsandaffectthewaycomputersandwebsiteswork,however.Whenthelastleapsecondwasaddedbackin2012,morethanafewwebsiteshadsometrouble.AsreportedbyPhys,org,popularsites1ikethecommunitywebsiteRedditcrashedwhentheleapsecondwasadded.ForReddit,theprobl
4、emwaseventuallyfoundtobewithaLinuxsystemthatgotconfusedwhenitcheckedthenetworktimeandfoundanextrasecond・SpeakingtoWiredabouttheproblembackin2012,LinuxcreatorLinusTorvaldscommented："Almosteverytimewehavealeapsecond,wefindsomething.It'sreallyannoying,becauseit's
5、code（代码）thatisalmostneverused,andthusnottestedbyusersundertheirnormalconditions.”Companieshavehadtothinkoftheirownsolutions,andGoogle，s"leapsmear”maybethebest~knownexample.AscompanyengineerChristopherPascoeexplainsinablogpost,companiesusuallytrytofixtheproblem
6、byturningbacktheclocksbyonesecondattheendofthedaysothattheyplaythatsecondagain.However,Pascoebelievesthiscreatesproblems.Heasked：“Whathappens?Doese-mailthatconiesinduringthatsecondgetstoredcorrectly?”Googlehasasolution：Cuttheextrasecondintomillisecondsandthenp
7、utthesetinyamountsoftimeintothesystemthroughouttheday."Thismeansthatwhenitbecametimetoaddanextrasecondatmidnight,”saysPascoe."Ourclockshavealreadytakenthisintoaccountoverthecourseoftheday.”FormanycompanieswithoutGoogle"smoney,however,theleapsecondwilllikelysti
8、llcausesomecrashes.Don"tworry,though—atleastitwon'tlastlong!语篇解读木文主要介绍了“闰秒”带来的影响及其解决方案。1.Whydoweneedtoaddaleapsecond?A・Theworld，satomicclocksaresettodoso.B・Tokeepintimewiththeworld
