全国职称英语等级考试全真题（理工类）

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1、精品文档全国职称英语等级考试全真题（理工类）Passage2Inearliesttimes,menconsideredlightningtobeoneofthegreatmysteriesofnature.Someancientpeoplebelievedthatlightningandthunderweretheweaponsofthegods.Inreality,lightningisaflowofelectricityformedhighabovetheearth.Asingleflashoflightning1.6kilometerslonghasenoughelectricityt

2、olightonemillionlightbulbs.TheAmericanscientistandstatesman,BenjaminFranklin,wasthefirsttoshowtheconnectionbetweenelectricityandlightningin1752.Inthesameyearhealsobuiltthefirstlightningrod.Thisdeviceprotectsbuildingsfromdamagebylightning.Modernsciencehasdiscoveredthatonestrokeoflightingcontainsmore

3、than15millionvolts.Asparkbetweenacloudandtheearthmaybeaslongas13kilometers,andtravelataspeedof30millionmeterspersecond.Scientistsestimatethatthereareabout2000million2016全新精品资料-全新公文范文-全程指导写作–独家原创10/10精品文档flashesoflightningperyear.LightninghitstheEmpireStateBuildinginNewYorkCity30to48timesayear.Inthe

4、UnitedStatesalongitkillsanaverageofonepersoneveryday.Thesafestplacetobeincaseofanelectricalstormisinaclosedcar.Outside,oneshouldgotolowgroundandnotgetundertrees.Also,oneshouldstayoutofwaterandawayfrommetalfences.Insideahouse,peopleshouldavoidopendoorwaysandwindowsandnottouchwiresormetalthings.Withl

5、ightning,itisbettertobesafethansorry!Notlongago,anairplanewasflyingoverNewZealand.Therewasatelevisioncameracrewonboard.Suddenly,outinthenightsky,abrightsphere(球体)cameintoview.Everyoneonboardsawitandeveryonethough,“UFO”-UnidentifiedFlyingObject.Thecameracrewwentintoactionandstartedfilming.Thatweekpe

6、opleallovertheworldsawthefilmofthismysteriouslightontheirtelevisionscreens.Whatwasit?Wasitaspaceshipfullofvisitorsfromanotherplanet?Thecaptainoftheaeroplaneandthefilmcrewbelieveditwas.Otherobservershadmanydifferentexplanations.2016全新精品资料-全新公文范文-全程指导写作–独家原创10/10精品文档SomesaiditwasVenus(金星).Otherssaidi

7、twasjustatrickoflight.Anairtrafficcontrolleralsosawitonhisradarscreen.Hethoughtthataflockofbirdswascausingdotsonhisradarscreenwhenthe“UFO”appeared.Mostastronomersnowbelievethatwhatthesepeoplesawwasalmostcer