新概念英语第四册第28课课后答案:新概念英语第四册第13课课后习题及答案

新概念英语第4册课后习题答案:
　　Unit 13 ACDAC BDABC AD
　　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 Deep drilling techniques have improved greatly because _______.
　　a.of the need to locate oil
　　b.it is necessary to go down as much as 25,000 feet
　　c.there is no need to send men down deep holes to get oil
　　d.of the constant search for mineral deposits
　　2 It's necessary to put up an oil derrick _____.
　　a.because it is like a giant block and tackle
　　b.to rotate the engine at the top
　　c.to control all the equipment needed to drill a deep hole
　　d.to decide exactly where to drill for oil
　　3 The only way of knowing what rocks the drill has reached is to _____.
　　a.cut clean cylinders of rock
　　b.use the coring bit
　　c.take note of the strata below the surface
　　d.bring up specimen material from time to time
　　4 If you don't control the oil pressure ________.
　　a.oil will be forced to the surface with great force
　　b.mud will have to be circulated down the drill pipe
　　c.you will have to catch the oil at the surface
　　d.water will gush to the surface
　　Structure 句型
　　5 The holes made for oil go down as ______ as 25,000 feet.(1.1)
　　a.many
　　b.long
　　c.far
　　d.distant
　　6 Nothing has done as _____ as to improve deep drilling as the search for oil.(11.3-4)
　　a.many
　　b.much
　　c.long
　　d.far
　　7 The geologist needs to know ______ rocks the drill has reached.(1.8)
　　a.that
　　b.when
　　c.how
　　d.which
　　8 _____ we get down to the oil, it usually flows with great pressure.(1.10)
　　a.Immediately
　　b.The first time
　　c.Until
　　d.As long as
　　Vocabulary 词汇
　　9 The holes are only borings, less than a foot _____ .(11.2-3)
　　a.round
　　b.across
　　c.through
　　d.along
　　10 The engine at the top makes the drill pipe go ______.(1.6)
　　a.up and down
　　b.in and out
　　c.round and round
　　d.deeper and deeper
　　11 ______ a sample is obtained with a coring bit.(11.8-9)
　　a.Every now and again
　　b.In one way or another
　　c.Often but not always
　　d.After a long time
　　12 We _____ avoid the old, romantic idea of a gusher.(1.12)
　　a.make sure we
　　b.can't
　　c.attempt
　　d.try to

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