国开《 综合英语(3)》Unit7 单元练习

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Vacabulary

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Choose the best answer for each of the following items.

1.As time passed, many more ______ for the laser were developed. 

 applications

applicants 

applies 

applying 

2.Lasers are also important in the _______ of cancer.

 heal 

recover

treat 

 treatment

3.The word laser ________ “light amplification by stimulated emission of radiation”. 

stand by

 stands for

stand in 

stand out 

4.The light from a laser _______ in a narrow beam.

 

connects  

contacts 

concentrates 

 confines 

5.Laser is ___ by a process called stimulated emission. 

 produced 

created  

born  

chosen 

6.A laser beam can be made narrow enough to ______ a single cell. 

focus on

pay attention to 

concentrate on

 lay stress on  

7. As the laser was developed, scientists began thinking of  _______ applications for it. 

particular

special  

practical  

especial 

8.A laser beam can completely destroy a cancerous growth without ______ any dangerous cells.

leaving alone 

leaving behind 

 leaving off

leaving out 

9.Scientists study how the plants ______ sunlight into energy.

change

convert

shift 

transform 

10.The light from the sun moves away from its source in all directions, so its strength is very _______.

broken out

 spread out

 looked out 

figured out 

11.A person working with a laser can ____ this coherent light in any direction. 

purpose  

 goal 

 aim  

target

12.One of the earliest uses was to make _______ measurements of distance and speed. 

 precise

definite 

absolute   

 exact 

13.More recently, lasers have been used to ______ skin discolorations. 

 take 

 remove 

recover 

move 

14.Over the past twenty years, personal computers have brought ______ changes to the home and workplace. 

gigantic 

curious

terrible  

tremendous 

15.Now it is clear that laser light has ______ applications. 

dangerous 

coherent  

mysterious 

numerous   

16.It sounds ______ the problem is in the engine.

 like 

as though  

although  

 if  

17.A scientific discovery is often made long before someone is able to put it to ______.

usage  

using

 use  

 used

18.Scientist discovered how to _____ atoms decades before the invention of atomic bomb.

 split  

 break   

destroy     

tear

19.To many people, lasers are very ________, but a laser is simply a device that produce a very strong light. 

mysterious

fantastic

 terrific  

amazing 

20.The atoms of a certain substance are ______ in such a way that they produce coherent light.

excited

 produced

 created 

chosen 

Grammar

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Choose the best answer for each of the following items.

21.It __________ to have been ready last week. But you haven’t done it.

supposes 

is supposed 

was supposed  

 supposed 

22.The atoms of certain substance are excited in such a way ______ they produce coherent light. 

 which   

who   

 that  

what

23.The light from a laser, ______ in only one direction and ________ in a narrow beam, is much stronger.

moves; concentrates  

moving; concentrating

 moving; concentrated

moved; concentrates

24.A person ___ with a laser can aim this coherent light, ____ a laser beam, in any direction.

 work; call 

working; called  

working; call 

worked; calling 

25.I was driving to work yesterday, and it _______ as if smoke ________ out of the exhaust pipe. 

looks … came 

 looked … was coming

 is looking … came

 looks … is looking 

26.A laser beam ________ on a single cell, on part of a cell, or even individual atoms and molecules. 

makes enough narrow focus 

 is made enough narrow to focus   

can be made narrow enough to focus  

 may be made enough narrow to focus  

27.Incoherent light, like the light from the sun or the light bulb, ________ from its source in all directions. 

move away

moving away

moves away  

moved away 

28.My roof leaks when it rains and it hasn’t been repaired. When I got home yesterday, the water ________ into my living room.

 poured 

was pouring

was poured  

 pouring 

29.Laser light is created by a process _____ stimulated emission.

called  

calling 

is calling  

is called 

30.The TV set hasn’t been repaired yet. It looks ________ it will be another week. 

as if  

 although  

like    

 if

Dialogue

\n

Choose the best answer for each of the following items.

31.– Repair department. May I help you?

– __________________________________.

Yes. I’d like to know if my CD player has been repaired yet.

 I asked for the repair department.

Just a moment, please. The manager will be in soon. 

32.– Sorry, sir, it’s not ready yet.

– ___________________.

 Please do. I’ll be waiting. 

Ok, hold on, please.

Not yet? Is there some problem?

33.– Is there some problem?

– _______________________.

I am sorry. The parts have been ordered, but they haven’t come in yet.

It was supposed to have been ready last week.

 I will call you as soon as the repair is finished. 

34.– I need to speak to Mr. Tucker. This is a very urgent matter.

– ­­­­­­­­­­­­­_________________________________________.

Just a minute. Sorry, it is not ready yet.

what’s the problem?

 please, I will be waiting. 

35.– Hello, Mr. Snyder. What can I do for you?

– ______________________________.

My car sounds like a motorboat at full speed. 

It looks as if you need a new radio.

We’ll take a closer look, and get back to you later today. 

Reading

\n

Read the following passages and choose the best answer for each of the following questions.

Passage 3

\n

 

\n

  A friend of mine was fond of drawing horses. He draw the horses very well, but he always begins with the tail. Now it is the Western rule to begin at the head of the horse, which is why I am surprised. It strikes me that it could not really make any difference whether the artist begins at the head or the tail or the belly or the foot of the horse, if he really knows his business. And most great artists who really know their business do not follow other people\’s rules. They make their own rules. Every one of them does his work in a way peculiar to himself; and the peculiarity means only that he finds it easier to work in that way.

\n

  Now the very same thing is true to literature. And the question, \”How shall I begin?\” only means that you want to begin at the head instead of beginning at the tail or somewhere else. That is, you are not yet experienced enough to trust your own powers. When you become more experienced you will never ask the question, and I think that you will often begin at the tail – that is to say, you will write the end of the story before you have even thought of the beginning.

36.A friend of the writer\’s draw the horses ____.

 very well

in the way of western rule

 in the way of his own rule

all of the above

37.The writer is surprised because ____.

the Western artist begins to draw at the head of the horse

the artist begins to draw at the tail of the horse

 the artist makes his own rule

 the artist does not follow other people’s rule

38.You are not yet experienced because ____.

 you don’t know where to begin with

you want to begin at the head instead of beginning at the tail

you always asked questions

you do not trust your own powers

39.When you become more experienced in writing, you will probably ____.

never ask questions

often begin at the tail

write the end of the story

think of the beginning

40.The topic of the passage is “______”.

How to draw a horse

How to write a story

How to make your own rules

 Make your own rules

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