新概念英語(yǔ)第四冊(cè)課后習(xí)題及答案第7課

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新概念英語(yǔ)第4冊(cè)課后習(xí)題答案:
    Unit 7 DCABA BACDA AC
    新概念英語(yǔ)第4冊(cè)課后習(xí)題:
    Multiple choice questions 多項(xiàng)選擇題
    Choose the correct answers to the following questions.
    Comprehension 理解
    1 What happens if you shout on a mountainside?
    a.You will be able to measure distance.
    b.Nothing.
    c.It will take a long time for an echo to come back.
    d.You will hear an echo.
    2 You can measure the depth of the sea by ____.
    a.shouting so you get back an echo
    b.tapping on the hull of a ship
    c.working out how long it takes to get an echo from the sea bottom
    d.calculating the reflection
    3 The echo-location principle means you can even ____.
    a.locate and distinguish different species of fish
    b.hear a fish's echo
    c.improve the apparatus now in use
    d.easily catch different species of fish
    4 Bats use echo-location to ____.
    a.see where they're going
    b.avoid bumping into things
    c.avoid flying insects
    d.emit squeaks
    Structure 句型
    5 Not ____sound made by animals serves aslanguage.(l.1)
    a.every
    b.each
    c.the whole
    d.the entire
    6 We have only to turn to that extraordinarydiscovery of echo-location in bats to see a case____the voice plays a strictly utilitarian role.(11.1-2)
    a.which
    b.where
    c.when
    d.why
    7 ____ he shout in the vicinity of a wall, an echo will come back.(1.4)
    a.Should
    b.If
    c.When
    d.Though
    8 ____ the echo-sounding apparatus was born.(11.7-8)
    a.Such
    b.The way
    c.That's how
    d.Like this
    Vocabulary 詞匯
    9 The voice plays a strictly ____ role.(1.2)
    a.secondary
    b.important
    c.usual
    d.practical
    10 A sound made by ____ the hull of a ship - (11.5-6)
    a.hitting
    b.knocking
    c.beating
    d.bashing
    11 The sound varies ____the size and nature of the object.(11.8-9)
    a.depending on
    b.relating to
    c.influencing
    d.by
    12 A ____ of fish will do this.(1.9)
    a.class
    b.herd
    c.school
    d.flock