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If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the （）.
A . packing gland
B . mechanical seals
C . lantern rings
D . wearing ring
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You are about to configure PPP n the interface of a Cisco router. Which authentication methods could you use?（）
A . SSL
B . SLIP
C . PAP
D . LAPB
E . CHAP
F . VNP
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If you begin on time, group members who（）late will realize the value of time.
A . bring up
B . come up
C . dress up
D . show u
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You lost the index tablespace in your database. You are not able to use tablespace point-in-time recovery on the index tablespace. What could be the reason for this？（）
A . The index tablespace contains bitmap indexes.
B . The index tablespace contains more than one data file.
C . The index tablespace supports only complete recovery.
D . The index tablespace is not a dictionary-managed tablespace.
E . There is a dependency relationship between a table and its indexes.
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In heavy weather you notice buckling in the midships deck plating of your vessel. To relieve the strain you could（）.
A . pump fuel oil from midships to the ends of the vessel
B . reduce speed
C . take a course which most eases the vessel
D . All of the above
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Excuse me, could you tell me the time?（）
A . You'd better buy a watch.
B . It's three thirty by my watch
C . Can you see the clock?
D . It's late I think.
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A hurricane moving northeast out of the Gulf passes west of your position. You could expect all of the following EXCEPT（）.
A . higher than normal swells
B . high winds
C . winds veering from south，through west，to northwest
D . light shower
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Could you tell me the time? I’ve left my watch _________.
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________, but could you tell me the time?
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In the sentence of paragraph 1, “My mother believed you could be anything you wanted to be in America”, “you” refers to the narrator.
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判断正误：When you are interviewing, you could use a comfortable sitting posture, for example, sitting close to the back of the chair.
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___________ you, but could you help me one more time with the copier?
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In which source could you find the number of a chart for a certain geographic area?
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According to the New York Times' report, a combination of two new drugs could
A．reduce the size of all tumors.
B．prevent breast cancer.
C．cure various diseases.
D．prevent uterine cancer.
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听力原文：W: Could we talk a little about the problem of the old？ I wonder if you could begin by telling us the importance of this problem.
M: Well, of course it is an increasingly serious problem, I mean a fairly large part of the old population becomes confined to the house. They cannot go out, because they don't want to trouble others, thus little by little they become a burden to the younger generation.
Q: What are the speakers talking about？
(17)
A．Population explosion.
B．Generation Gap.
C．Problem of the aged.
D．Climate changes.
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Could you please（)this report to the chairman of the department？
A．subjct
B．surprise
C．satisfy
D．submit
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—I’ve run out of cash Could you lend me a few pounds this evening？ —_____ I’ll just have to find time to get to the bank and make a withdrawal.
A.I can lend you some now.
B.I’m not sure I’ve got any either.
C.Sorry, I haven’t got a penny in my account.
D.My credit card must be left home
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Could you tell me the name of your group?( )
A:My name is David Miller.
B:Yes. My wife and me.
C:The Harbin Tour Group.
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—Do you remember the first time we met？ —Of course. You（) an evening party.
A．A.organized
B．B.have organized
C．C.had organized
D．D.were organizing
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Man: Look, the view is fantastic．Could you take a picture of me with the lake in the background？
Woman: I'm afraid I just ran out of film.
Question: What do we learn from the conversation？
A．The woman is watching an exciting film with the man.
B．The woman can't take a photo of the man.
C．The woman is running toward the lake.
D．The woman is filming the lake.
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Any physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it. No matter how many times the results of experiments agree with some theory, you can never be sure that the next time the result will not contradict the theory. On the other hand, you can disprove a theory by finding even a single observation that disagrees with the predictions of the theory. As philosopher of science, Karl Popper has emphasized a good theory is characterized by the fact that it makes a number of predictions that could in principle be disproved or falsified by observation. Each time new experiments are observed to agree with the predictions the theory survives, and our confidence in it is increased; but if ever a new observation is found to disagree, we have to abandon or modify the theory. At least that is what is supposed to happen, but you can always question the competence of the person who carried out the observation.
In practice, what often happens is that a new theory is devised that is really an extension of the previous theory. For example, very accurate observations of the planet Mercury revealed a small difference between its motion and the predictions of Newton's theory of gravity. Einstein's general theory of relativity predicted a slightly different motion from Newton's theory. The fact that Einstein's predictions matched what was seen, while Newton's did not, was one of the crucial confirmations of the new theory. However, we still use Newton's theory for all practical purposes because the difference between its predictions and those of general relativity is very small in the situations that we normally deal with. (Newton's theory also. has the great advantage that it is much simpler to work with than Einstein's ! )
It turns out to be very difficult to devise a theory to describe the universe all in one go. Instead, we break the problem up into bits and invent a number of partial theories. Each of these partial theories describes and predicts a certain limited class of observations, neglecting the effects of other quantities, or representing them by simple sets of numbers. It may be that this approach is completely wrong. If everything in the universe depends on everything else in a fundamental way, it might be impossible to get close to a full solution by investigating parts of the problem in isolation. Nevertheless, it is certainly the way that we have made progress in the past. The classic example again is the Newtonian theory of gravity, which tells us that the gravitational force between two bodies depends only on one number associated with each body, its mass, but is otherwise independent of what the bodies are made of. Thus one does not need to have a theory of the structure and constitution of the sun and the planets in order to calculate their orbits:
Today scientists describe the universe in terms of two basic partial theories-the general theory of relativity and quantum mechanics. They are the great intellectual achievements of the first half of this century. Unfortunately, however, these two theories are known to be inconsistent with each other-they cannot both be correct. One of the major endeavours in physics today, is the search for a new theory that will incorporate them both-a quantum theory of gravity. We do not yet have such a theory, and we may still be long way from having one, but we do already know many of the properties that it must have.
According to the passage, why can't any physical theory be permanently established？
A．Such a theory is only suggested as a possible way of explaining an idea.
B．The person proposing such a theory may be incompetent.
C．Observations always disagree with predictions.
D．Observations are always falsified by predictions.
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______ on the hilltop, you could enjoy the scenery of the city bathed in the sun.
A: Standing
B; Stand
C; Stood
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Which of the following sentences does NOT indictebility Is therenything I cn do foWhich of the following sentences does NOT indictebility Is therenything I cn do for you B．I’ll beble to spek Chinese innother two months. C．Where cn he be D．t tht time I could red without spectcles.
A．Is there anything I can do for you
B．I’ll be able to speak Chinese in another two months．
C．Where can he be
D．At that time I could read without spectacles．
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— My English is relly poor. Could you give me somedvice — If you mde ______ most of your time, t— My English is relly poor. Could you give me somedvice — If you mde ______ most of your time, there would be ______ big improvement.不填; 不填 B．the; 不填 C．the; the D．the;
A．不填; 不填
B．the; 不填
C．the; the
D．the; a
