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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?Testswithartificialstarshaveprovedthatcertainnightflyingbirdsa
2、reabletofollowthestarsintheirlong-distanceflights.Adovehadspentitslifetimeinacageandhadneverflownundera18(nature)sky.Yet19showedaninbornabilitytousethestarsforguidance.Thebird’scage20(place)underanartificialstar-filledsky.Thebirdtriedtoflyinthesamedirectionast
3、hat21(take)byhisoutdoorcousins.Anychangeinthepositionofthemake-believestarscaused22changeinthedirectionofhisflight.Scientiststhinkthatdoves,when23(fly)indaylight,usethesunforguidance.Butthestarsareapparentlytheirprincipalmeansofnavigation.Whatdotheydo24thestar
4、sarehiddenbyclouds?Apparently,theyfindtheirwaybysuchlandmarksasmountainranges,coastlines,andrivercourses.Butwhenit’stoodarktoseethese,thedovescircle25(help),unabletogettheirposition.16.on17.that/which18.natural19.it20.wasplaced21.taken22.a23.flying24.when/if25
5、.helplesslyWeChatwaslaunchedonJan12,2011,andtookmorethanayear16(draw)100millionusers.BySeptember，2012,it17(reach)the200millionmark,Tencentsaid.Thenumberofpeople18(use)WeChat,avoice-messagingservicedevelopedbytheInternetgiantTencentHoldings,hashit300millioninth
6、elessthantwoyears19theservicewasreleased,theShenzhen-basedcompanysaidonWednesday."The300millionnumberis20milestoneforWeChat,andwehopetheservicewillbereadytoperform21theglobalstagein2013,"PonyMa,Tencentchairmanandchiefexecutiveofficer,saidonhismicroblogonWednes
7、daymorning.珠海2013年二模ThefunctionofWeChatisverysimilartothetextmessagingandvoicecallservices22areprovidedbytelecomcarriers.Latelastyearsawthe23(introduce)ofanEnglishversionofWeChatinabidtodrawmoreinternationalusers.TencenthasreleasedversionsinArabic,Italian,Viet
8、namese,JapaneseandThai.Tencentsaiditis24(most)pursuingitsexpansionplansinemergingandAsianmarkets.Itsaidthecompanyfinds25easiertoreachitsgoalsinsuchplaces,inpartbecausetheyhavecultu
