新概念英語第4冊課后習題答案:
    Unit 23 CADCC DCABC AC
    新概念英語第4冊課后習題:
    Multiple choice questions 多項選擇題
    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 詞匯
    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