新概念英语第四册课后答案详解-新概念英语第四册课后习题及答案第7课

新概念英语第4册课后习题答案:
　　Unit 7 DCABA BACDA 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 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 词汇
　　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

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