It is found by the Pew Research Center that more and more of the least educated men_____． A)earn less than their wives B)are declined by white-collar women C)refuse to malty white-collar women D)have to remain single

A . dead reckoning B . dead weight C . dead slow ahead D . dead slow aster

A . American Consul B . Chief and Second Mates C . Vessel's agent D . vessel's owner

A . drill holes through the heavy side of the impeller until it balances B . weld counterweights to the light side of the impeller C . remove metal from the heavy side by machining in a lathe D . acid wash and serape the heavy side until it balance

A . water B . oil C . scale D . ridge

A . the DBNEWID utility B . the ANALYZE command C . the RMAN LIST command D . the RMAN REPORT command E . the RMAN CROSSCHECK command F . the RMAN BLOCKRECOVER command

A . Bill of health B . Free Pratique C . Notice to Comply D . Controlled Free Pratique

A . tighted formally B . shut tightly C . combined properly D . closed suitably

A . Crew members requesting the survey B . American Consul C . Master D . Vessel's owner

A．True B．False

A:are taken B:be taken C:were taken D:must be taken

A. challenged B. assumed C. deducted D. decreed

Three-quarters of the world is covered with water. But only three percent of this water is fresh. All the rest is salt, and fills the oceans and the great inland seas. It is the salt that makes sea water useless to man. If you take the salt away the water can be used for drinking and for watering plants. In 1962 President John Kennedy of the United States said, "When man discovers how to mm salt water into fresh water cheaply, he will have made a much more important scientific advance than when he first landed on the moon". Human beings need water for【46】,【47】and【48】and【49】. Main idea: The【50】

The only solid piece of scientific truth abut which I feel totally confident is that we are profoundly ignorant about nature. Indeed, I regard this as the major discovery of the past hundred years of biology. It is, in its way, an illuminating piece of news. It would have amazed the brightest minds of the 18th. century Enlightenment to be told by any of us how little we know and how bewildering seems the way ahead. It is this sudden confrontation with the depth and scope of ignorance that represents the most significant contribution of the 20th century science to the human intellect. In earlier times, we either pretended to understand how things worked or ignored the problem, or simply made up stories to fill the gaps. Now that we have begun exploring in earnest, we are getting glimpses of how huge the questions are, and how far from being answered. Because of this, we are depressed. It is not so bad being ignorant if you are totally ignorant; the hard thing is knowing in some detail the reality of ignorance, the worst spots and here and there the not-so-bad spots, but no true light at the end of the tunnel nor even any tunnels that can yet be trusted. But we are making a beginning, and there ought to be some satisfaction. There are probably no questions we can think up that can' t be answered, sooner or later, including even the matter of consciousness. To be sure, there may well be questions we can't think up and therefore limits to the reach of human intellect, but that is another matter. Within our limits, we should be able to work our way through to all our answers, if we keep at it long enough, and pay attention. According to the author, really good science ______. A．would surprise the brightest minds of the 18th century Enlightenment B．will help people to make the right choice in advance C．will produce results which cannot be foreseen D．will bring about disturbing results

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.

The situation presented by the () is very limited. It mainly focuses on the world of individual persons, so it is an effective device for describing the world of individual characters, which can be used as a life model or example of individual persons. A、first person calculator B、first person interlocutor C、first person narrator D、first person coordinator

A．However B．That C．Because D．Whatever

A．application B．foundation C．institution D．instruction

A．That B．What C．Whatever D．However

A．who B．how C．where D．that

A．A.eagerly B．B.immediately C．C.gradually D．D.hopefully