北京市城六区2018届高三一模英语试题分类汇编之7选5含答案

《北京市城六区2018届高三一模英语试题分类汇编之7选5含答案》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、【海淀一模】第二节（共5小题；毎小题2分，共10分）根据短文内容，从短文后的七个选项中选出能填人空白处的最佳选项。选项中有两项为多余选项。Radarisanelectronicdevicethatdetectsplanes,ships,coastlines,landmarks,andevenstormclouds・Thenameradarcomesfromthefirstlettersofthewordsradiodirectionandranging・Asthehumaneyeuseslightwavestosee,radar"sees"withradiowaves.Wi

2、thoutradar,planescouldnotlandsafelyinbadweatherandshipscouldnotmovesafelyinthickfog.51Inthe1800sitwasdiscoveredthatradiowavescouldbereflectedfromobjects.Butscientistsdidnotmakegreatadvancesinradarresearchuntilthe1930s,whentheworldwasthreatenedbywar.52Ithasbeenusedwidelyinalmosteveryconflic

3、tsincethen.Echoesmakeitpossibleforradartowork・Whenabeamofradiowavesissentout,itstrikesonanobjectandreturnsanecho.Thisechoispickedupbyradarandrecordedonascreensimilartotelevisionscreen.Onthescreenanobserverseesaflash,orablip,thatshowsthedirectionanddistanceoftheobject.53Airportcontroltowers

4、useradartoguideplanesinforsafelandings.Almostalllargeshipsdependonradartopreventcollisionswithicebergsorotherships・54Weatherforecasters"see"thesize,direction,andspeedofstormsonradarscreens・Astronomerscanevenuseradartomeasureaccuratelythedistaneetothemoon.Thus,thedevicehasgeneratedmajoradva

5、ncements.55HugeradarantennashavebeeninstalledallovertheUnitedStates・Theyguardusagainstpossibleenemyattacks・Wehaveballistic—missiles（丿戊略导弓单）warningsystemsthatcanalertustoattackswhenmissilesaremorethan1,000milesaway・Otherradarsystemswarnusagainstenemyaircraftandevenspyingspacesatellites・A.Po

6、licetrackspeedersinradar-equippedcars・B.Thesemeasurementsarenowhighlyaccurate・C.Thedevicecanbeusedinawiderangeoffields.D.Itisthereforeespeciallyvaluabletoshippersandtravelers・E.DuringWorldWarIImanycountriesusedradareffectively.F・Todayradarisusedbycommercialairlinersandweatherforecasters・G.

7、Strengtheningnationaldefenseisoneofradar'smostimportantfunctions.第二节（共5小题；每小题2分，共10分）51.D52.E53.B54.A55.G【西城一模】第二节（共5小题；每小题2分，共10分）根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。TheArtofSlowReadingIfyouarereadingthisarticleinprint,chancesarethatyouwillonlygetthrou