What is a sure fact?

A . interested… interest B . interesting… be interested C . interested… be interesting D . interesting… interest

A . negative GM B . flooding C . off-center weight D . reserve buoyancy

A . lsdev B . lsattr C . entstat D . ifconfig

M: But you aren't even considering my personal problems. How am I supposed to concentrate on books when my father is in the hospital with cancer？ Q: Why is the boy being expelled？ (15) A．His father is sick. B．He doesn't like school. C．He causes a lot of trouble. D．He's a poor student.

A. counts B. applies C. stresses D. functions

A．You will be too excited to watch the traffic． B．Enjoying electronic devices while walking may invite ti"affie accidents． C．It is not possible for you to get such a backpack． D．It is wise of you to have such a backpack． 此题为多项选择题。

A．A.do me a favor B．B.be in favor C．C.be for favors

A.Modern B.That modern C.What modern D.It is modern

A．Difficulty in adjusting to changes leads to alcoholism. B．Nutritional deficiency is a major cause of alcoholism. C．The rate of alcoholism is low in a group where customs toward drinking are fixed. D．Man cannot be exempt from physical and social stresses.

A．Black holes are dead stars. B．Black holes have gravity. C．Black holes are invisible. D．There is nothing as mysterious as a black hole. 此题为多项选择题。

No man ever looks at the world with pristine(未受外界影响的) eyes. He sees it edited by a definite set of customs and institutions and ways of thinking. Even in his philosophical probings he cannot go behind these stereotypes(固定的模式); his very concepts of the true and the false will still have reference to his particular traditional customs. John Dewey has said in all seriousness that the part played by custom in shaping the behavior. of the individual as over against any way in which he can affect traditional custom, is as the proportion of the total vocabulary of his mother tongue over against those words of his own baby talk that are taken up into the language of his family. When one seriously studies social orders that have had the opportunity to develop independently, the figure(这种比喻) becomes no more than an exact and matter-of- fact observation. The life history of the individual is first and foremost an adjustment to the patterns and standards traditionally handed down in his community. From the moment of his birth the customs into which he is born shape his experience and behavior. By the time he can talk, he is the little creature of his culture, and by the time he is grown and able to take part in its activities, its habits are his habits, its beliefs his beliefs, its impossibilities his impossibilities. The author thinks the reason why custom has been ignored in the academic world is that______. A．custom reveals only the superficial nature of human behavior B．the study of social orders can replace the study of custom C．people are still not aware of the important role that custom plays in forming our world outlook D．custom has little to do with our ways of thinking

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.