新概念第四册第23课练习题及答案Unit 23 CADCC DCABC AC新概念英语第4册课后习题:Multiple choice questions 多项选择题Choose the correct answers to the following questions.Comprehension 理解1 The two classes of flight depend on _.a.occasional movement and progressb.wing span and glidingc.gliding and muscle-powerd.wind currents and machinery2 The albatross can keep flying for very long periods because it _.a.actively uses air movement to stay in the skyb.it is a very great birdc.recognizes ships at sead.it can glide in any direction, regardless of air currents3 Ducks can fly in any direction _.a.and stay in the air indefinitelyb.but are too heavy to fly for longc.and uses engine powerd.but can run out of energy4 The swallow _.a.is often greeted by superstitious villagersb.is good for peoplec.combines both forms of flightd.is an omen of good luckStructure 句型5 The albatross _to yield to the opposition ofthe wind.(1.6)a.mustb.couldc.hasd.should6 The duck comes nearer to the engines _manhasconqueredthe air with.(11.7-8)a.whereb.whoc.whomd.-7 Partridges _a like power of strong propulsion.(1.11)a.containb.providec.possessd.display8 It _, not does it boast of its power.(1.13)a.does not tireb.not tirec.not tiresd.do not tireVocabulary 词汇9 There is no _to the variety of flight practised by birds.(1.1)a.opportunityb.endc.pointd.goal10 The great bird has_ wings.(1.5)a.broadb.longc.huged.wide11 Duck, like pigeons, are _with steel-like muscles.(1.8)a.providedb.giftedc.talentedd.inherited12 We no longer look for _in the way they fly.(11.15-16)a.guidesb.noticesc.signsd.signals