新概念英语第四册听力:新概念英语第四册：第13-15课练习及答案

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【篇一】Unit 13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

       课后习题答案:

　　Unit 13 ACDAC BDABC AD

     【篇二】Unit 14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 reason it's hard to forecast the weather is that ______.

　　a.conditions rapidly deteriorate

　　b.there is always turbulence

　　c.only satellites have a panoramic view of conditions

　　d.the effect of tiny changes cannot be detected or calculated

　　2 Even with grid points which are sixty miles apart, forecasters _____.

　　a.have to depend on satellites for information

　　b.have to make assumptions about some of the data

　　c.work on modern weather models

　　d.prevent errors from multiplying

　　3 Which of these statements is true?

　　a.The only way to solve the problem is to have sensors spaced at one-foot intervals.

　　b.The only way to solve the problem is to have infinitely powerful computers.

　　c.The only way to solve the problem is to have perfectly accurate readings.

　　d.At present, there is no way of making absolutely accurate predictions.

　　4 Tiny variations in temperature, pressure and humidity _____.

　　a.will be picked up by sensors at one-minute intervals

　　b.are used to predict the weather one month ahead

　　c.can lead to completely unexpected weather conditions

　　d.produce expected results

　　Structure 句型

　　5 Generally speaking, any prediction ______ rapidly.(1.2)

　　a.is deteriorating

　　b.has deteriorated

　　c.will deteriorate

　　d.had deteriorated

　　6 Only satellites _______ see continent-size features.(11.5-6)

　　a.are able to

　　b.could

　　c.are possible

　　d.are capable

　　7 _____ the earth could be covered with sensors.(11.9-10)

　　a.Providing that

　　b.On condition that

　　c.Say

　　d.Allowing that

　　8 The computer will be incapable ______ whether Princeton will have sun or rain one month away.(11.13)

　　a.predict

　　b.to predict

　　c.of predicting

　　d.predicting

　　Vocabulary 词汇

　　9 The world's best weather forecasts are based on _______.(1.1)

　　a.certain knowledge

　　b.guess work

　　c.scientific facts

　　d.accurate calculation

　　10 The modern weather models work with a _____ of points.(1.7)

　　a.scale

　　b.balance

　　c.line

　　d.network

　　11 ‘Humidity’ refers to ______.(1.11)

　　a.light

　　b.water vapour

　　c.pressure

　　d.heat

　　12 An infinitely powerful computer takes in all the data and _____ what will happen.(11.11-12)

　　a.predicts

　　b.foretells

　　c.estimates

　　d.works out

      课后习题答案:

　　Unit 14 DBDCC ACCBD BD

     【篇三】Unit 15 课后习题

　　Multiple choice questions 多项选择题

　　Choose the correct answers to the following questions.

　　Comprehension 理解

　　1 Fear of industrial espionage ______.

　　a.leads to lack of freedom in scientific research

　　b.especially applies to scientific research of a general and fundamental nature

　　c.can lead to secrecy in scientific research

　　d.creates an atmosphere of distrust in business

　　2 Which of these statements is true?

　　a.Some kinds of scientific research are ‘more secret’ than others.

　　b.All kinds of scientific research are top secret.

　　c.Firms never tell anyone anything about their scientific research.

　　d.Scientific research workers never speak to each other.

　　3 Firms want to be sure ______.

　　a.they limit all those engaged in carrying out scientific research

　　b.that larger companies can't find out about their scientific research

　　c.they are working in an atmosphere of complete secrecy

　　d.they own the rights to intellectual property before they reveal what they're doing

　　4 The possibility of making discoveries by accident ______.

　　a.make it difficult to obtain scientific books from libraries

　　b.encourages competition from other agents

　　c.increases the need for secrecy

　　d.means that every discovery has to be patented

　　Structure 句型

　　5 One is the general atmosphere of secrecy ______.(11.1-2)

　　a.which it is carried out

　　b.which is carried out

　　c.it is carried out

　　d.it is carried out in

　　6 ______ any inquiry is a secret one, it naturallylimits - (1.3)

　　a.With regard to

　　b.As well as

　　c.Supposing that

　　d.To the extent that

　　7 Some of the bigger firms are engaged inresearches which are ______ general that it is apositive advantage to them not to keep themsecret.(11.6-7)

　　a.such

　　b.so

　　c.so that

　　d.in order that

　　8 They ______even more processes as secret processes.(11.8-9)

　　a.keep

　　b.kept

　　c.are kept

　　d.are keeping

　　Vocabulary 词汇

　　9 There is the ______of freedom of the individual research worker.(1.2)

　　a.loss

　　b.emptiness

　　c.absence

　　d.luck

　　10 It naturally limits all those engaged in ______.(1.3)

　　a.performing it

　　b.involving it

　　c.betrothed to it

　　d.allowing it

　　11 It is ______not to keep them secret.(11.6-7)

　　a.with their knowledge

　　b.on their account

　　c.in their best interests

　　d.for their benefit

　　12 Sometimes the secrecy goes to such a ______that ...(1.1.10-11)

　　a.degree

　　b.process

　　c.limit

　　d.period

       课后习题答案:

　　Unit 15 CADCD DBACA CA

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