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1、2013’最新语法填空精练2013年5月华南师大附中三模Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?Notlongago,experimentsshowedthatbirdsrely16thesuntoguidethemduringdaylighthours.Butwhataboutbirds17flybynight?Testswithartificialstarshaveprovedthatcertainnightflyingbirdsareabletofollowthestarsintheirlong-dist
2、anceflights.Adovehadspentitslifetimeinacageandhadneverflownundera18(nature)sky.Yet19showedaninbornabilitytousethestarsforguidance.Thebird’scage20(place)underanartificialstar-filledsky.Thebirdtriedtoflyinthesamedirectionasthat21(take)byhisoutdoorcousins.Anychangeinthepositionofthemake-believestarsc
3、aused22changeinthedirectionofhisflight.Scientiststhinkthatdoves,when23(fly)indaylight,usethesunforguidance.Butthestarsareapparentlytheirprincipalmeansofnavigation.Whatdotheydo24thestarsarehiddenbyclouds?Apparently,theyfindtheirwaybysuchlandmarksasmountainranges,coastlines,andrivercourses.Butwhenit
4、’stoodarktoseethese,thedovescircle25(help),unabletogettheirposition.16.on17.that/which18.natural19.it20.wasplaced21.taken22.a23.flying24.when/if25.helplesslyWeChatwaslaunchedonJan12,2011,andtookmorethanayear16(draw)100millionusers.BySeptember，2012,it17(reach)the200millionmark,Tencentsaid.Thenumber
5、ofpeople18(use)WeChat,avoice-messagingservicedevelopedbytheInternetgiantTencentHoldings,hashit300millioninthelessthantwoyears19theservicewasreleased,theShenzhen-basedcompanysaidonWednesday."The300millionnumberis20milestoneforWeChat,andwehopetheservicewillbereadytoperform21theglobalstagein2013,"Pon
6、yMa,Tencentchairmanandchiefexecutiveofficer,saidonhismicroblogonWednesdaymorning.珠海2013年二模ThefunctionofWeChatisverysimilartothetextmessagingandvoicecallservices22areprovidedbytelecomcarriers.Latelastyearsawthe23(introduce)ofanEnglishversionofWeChatinabidtodrawmoreinternationalusers.Tencenthasrelea
7、sedversionsinArabic,Italian,Vietnamese,JapaneseandThai.Tencentsaiditis24(most)pursuingitsexpansionplansinemergingandAsianmarkets.Itsaidthecompanyfinds25easiertoreachitsgoalsinsuchplaces,inpartbecausetheyhavecultu
