[新概念英语第四册第28课课后答案]新概念英语第四册第23课课后习题及答案

新概念英语第4册课后习题答案:
　　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 progress
　　b.wing span and gliding
　　c.gliding and muscle-power
　　d.wind currents and machinery
　　2 The albatross can keep flying for very long periods because it ______.
　　a.actively uses air movement to stay in the sky
　　b.it is a very great bird
　　c.recognizes ships at sea
　　d.it can glide in any direction, regardless of air currents
　　3 Ducks can fly in any direction ______.
　　a.and stay in the air indefinitely
　　b.but are too heavy to fly for long
　　c.and uses engine power
　　d.but can run out of energy
　　4 The swallow ______.
　　a.is often greeted by superstitious villagers
　　b.is good for people
　　c.combines both forms of flight
　　d.is an omen of good luck
　　Structure 句型
　　5 The albatross ______to yield to the opposition ofthe wind.(1.6)
　　a.must
　　b.could
　　c.has
　　d.should
　　6 The duck comes nearer to the engines ______manhas‘conquered’the air with.(11.7-8)
　　a.where
　　b.who
　　c.whom
　　d.-
　　7 Partridges ______a like power of strong propulsion.(1.11)
　　a.contain
　　b.provide
　　c.possess
　　d.display
　　8 It ______, not does it boast of its power.(1.13)
　　a.does not tire
　　b.not tire
　　c.not tires
　　d.do not tire
　　Vocabulary 词汇
　　9 There is no ______to the variety of flight practised by birds.(1.1)
　　a.opportunity
　　b.end
　　c.point
　　d.goal
　　10 The great bird has______ wings.(1.5)
　　a.broad
　　b.long
　　c.huge
　　d.wide
　　11 Duck, like pigeons, are ______with steel-like muscles.(1.8)
　　a.provided
　　b.gifted
　　c.talented
　　d.inherited
　　12 We no longer look for ______in the way they fly.(11.15-16)
　　a.guides
　　b.notices
　　c.signs
　　d.signals

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