10AlthoughAprildidnotbringustherainsweallhopedfor,andalthoughtheCentralValleydoesn’tgenerallyexperiencethesoundandlightningthatcangowiththeserains,it’sstillimportantforparentstobeabletoanswertheyouthfulquestionsaboutthunderandlightening.Thereasonthesetwowondersofnaturearesodifficultformanyadults(成年人)toexplaintochildrenisthattheyarenotverywellunderstoodbyadultsthemselves.Forexample,didyouknowthatthelighteningweseeflashingdowntotheearthfromacloudisactuallyflashinguptoacloudfromtheearth?Oureyestrickusintothinkingweseeadownwardmotionwhenit’sactuallytheotherwayaround.Butthen,ifwebelievedonlywhatwethinkandsee,we’dstillinsistthatthesunrisesinthemorningandsetsatnight.Mostlighteningflashestakeplaceinsidethecloud,andonlyarelativefewcanbeseenjumpingbetweentwocloudsorbetweenearthandacloud.But,withabout2,000thunderstormstakingplaceabovetheeartheveryminuteofthedayandnight,there’senoughactivitytoproduceabout100lightningstrikesoneartheverysecond.Parentscanusethunderandlighteningtohelptheirchildrenlearnmoreabouttheworldaroundthem.Whenunderstandthatthelightofthelightningflashingreachesthereyesalmostatthesamemoment,butthesoundofthethundertakesabout5secondstotraveljustonemile,theycanbegintotimetheinteral(间隔)betweentheflashandthecrashtolearnhowclosetheyweretotheactualspark(闪光).1.Accordingtotheauthor,intheareaoftheCentralValley,-_______________.A.rainsusuallycomewithoutthunderandlightningB.itisusuallydryinAprilC.childrenpaynoattentiontothetwonaturalwondersD.parentsarenotinterestedinthunderandlightening2.Webelievethatlighteningisadownwardmotionbecause__________________.A.weweretaughtbyourparentsfromourchildhoodB.wearetakeninbyoursenseofvisionC.itisacommonnaturalsightD.itisatruthprovedbyscience3.WhatisTRUEaboutlightningaccordingtothepassage?A.OnlyasmallnumberoflightningflashesoccuronearthB.Lightningtravels5timesfasterthanthunderC.LightningflashesusuallyjumpsfromonecloudtoanotherD.Therearefarmorelightningstrikesoccurringonearththanweimagine4.Theunderlinedword“activity“ismostcloselyrelatedtotheword(s)______________.A.“cloud”B.“lightningstrikes”C.“lightningflashes”D.“thunderstorms”5.Itcanbeconcluedfromthepassagethat________________.A.weshouldnotbelievewhatweseeorhearB.thingsmovingdownwardaremorenoticeableC.peopleoftenhavewrongideasaboutordinaryphenomena(现象)D．adultsarenotasgoodaschildreninobservingcertainnaturalphenomena
