uresneverfallbelowfreezing. D.It'sprettywarminthedayandverycoolatnightthroughouttheyear. 50.IfyouareplanningtospendyourholidaysinYellowstoneNationalParkinsummer,whatshouldyoutakewithyou? A.JustsomelightclothingsuchasTshirtsorskirts. B.Justsomewarmclothingsuchassweatersandcoats. C.Bothlightclothingandwarmclothing. D.Eitherlightclothingorwarmclothing. 51.Whatdoestheunderlinedword"readings"referto?"_____" A.literaryworksB.books C.announcementsD.figures E LouisArmstronghadtwofamousnicknames(绰号).SomepeoplecalledhimBagamo.Theysaidhismouthlookedlikealargebag.MusiciansoftencalledhimPops,asasignofrespectforhisinfluence(影响)ontheworldofmusic. Bornin1901inNewOrleans,hegrewuppoor,butlivedamonggreatmusicians.Jazzhadbeeninventedinthecityafewyearsbeforehisbirth.Armstrongoftensaid,"JazzandIgrewuptogether."