专业英语八级改错练习题及答案解析(19).doc

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1、专业英语八级改错练习题及答案解析(19)Since1965,whenitsequipmentbecameoperational,adevicecalledEroshasbeenhelpedtomakeskytrafficsafe.ErosisshortforEliminateRangeZeroSystem-rangezeromeaningcollision.BasicallyErosisacomputersystemmeasures,withgreatspeedandprecision,closingspeed(thespeedatwhichtwoobjec

2、tsareapproachingeachother)andrange(thedistanceapartoftheobjects).Eroscanwarnaircraftapproachableeachotheratjetspeedsandcanprovideprotectionforasmanyasathousandaircraftinwidearea.ThepilotofanEros-equippedaircraftheadingforacollisionhearawarningnoiseinhisearphoneswhenhisairbornecompu

3、tercalculatesthatheiswithinthirtysecondsorhalfamile(whicheveroccursfirst)ofotheraircraft.Atthesametime,aflashingredarrowonthedevicesindicatorpanelinstructshimtoclimb.Simultaneously,intheotheraircraft,thesignalisautomaticallyreversed:theflashingarrowtellsthepilottoclimb.ThenewerEros

4、IIsystemcanaccommodateatotaltwothousandsaircraftatonetimewithina140-mileradius.Everythreeseconds,eachEros-equippedplaneautomaticallyreportstogroundstationsandtosimilarlyequippedaircrafttheirpreciserange,altitudeandapproachrate.TheproducersofEros,theMcDonnellDouglassCorporationinthe

5、U.S.,arenowstudyingthefittingofErosandwilldomoretomaketheskysafer:theyshallalsolightentheworkofair-trafficcontrollersandincreasetheefficiencyofairports.1________2________3________4________5________6________7________8________9________10_______参考答案及解析：1.helped--helping。现在完成进行时。2.meas

6、ures前加that/which。that/which引导定语从句，修饰先行词acomputersystem。3.approachable--approaching。approaching为现在分词，修饰aircraft，相当于that/whichareapproachingeachother。4.hear--hears。其主语是thepilot。5.other--another。相对于上提到的anEros-equippedaircraft，此处为另一架飞机。6.climb--descend。根据上下文的意义，一架飞机下降，另一架飞机上升，以免相撞。7.th

7、ousands--thousand。根据语法规则，数词hundred、thousand、million等词一般为单数形式。8.their--its。指上文中的主语eachequippedplane。9.去掉make前的to。do与make并列作动词谓语。10.shall--will。表示一般将来，shall常用于第一人称，will则常用于第二和第三人称。