D
It is hard to predict（预言）how science is going to turn out, and whether it is really good science, it is impossible to predict．If the things to be found are actually new, they must be unknown in advance．You cannot make choices on this matter．You either have science or you don’t and if you have it you have to accept the surprising and disturbing pieces of information, along with the neat and useful bits．
The only solid piece of scientific truth about which I feel totally confident is that we don’t know enough about nature．Indeed, I regard this as the major discovery of the past hundred years of biology．It is, in its way, a clear piece of news．It would have amazed the brightest minds of the 18th century to be told by any of us how little we know and how strange the way ahead seems．In earlier times, they either pretended to understand how things worked or simply made up stories to give answers．Now that we have begun exploring seriously, we are catching sight of how huge the questions are, and how far from being answered．Because of this, we are sorry．It is not so bad being ignorant（无知的）if you are totally ignorant; the hard thing is knowing in some details 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．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．
51．Acoording to the writer, really good science________．
A．would surprise the brightest minds of the 18th  century．
B．will help people to make the right choice in advance
C．will produce results which cannot be predicted
D．will bring about disturbing results
52．It can be inferred from the passage that scientists of the 18th century________．
A．thought that they knew a great deal and could deal with most problems of science．
B．knew that they were ignorant and wanted to know more about nature
C．were afraid of facing up to the realities of scientific research
D．did more harm than good in man’s understanding of nature
53．Which of the following is NOT mentioned about scientists in earlier times?
A．They falsely declared to know all about nature．
B．They did not believe in results from scientific observation．
C．They paid little attention to the problems they didn’t understand．
D．They invented false rules to explain things they didn’t understand．
54．What is the writer’s attitude towards science?
A．He is sorry because of the ignorance of scientists．
B．He is delighted because of the latest scientific findings．
C．He is doubtful because of the great difficulties in scientific research．
D．He is confident though he knows well the great difficulties in scientific research．
55．The writer believes that sooner or later________．
A．man can’t deal with all the problems he can find because of the limits of human knowledge．
B．man can find solutions to whatever questions concerning nature he can think up
C．questions concerning nature are outsiede the field of scientific research
D．man can think up all the questions and answer them all．

C
The way people hold to the belief that a fun-filled, painfree life equals happiness actually reduces their chances of ever getting real happiness．If fun and pleasure are equal to happiness then pain must be equal to unhappiness．But in fact, the opposite is true: more often than not things that lead to happiness is connected with some pain．
As a result, many people avoid the very attempts（尝试）that are the source of true happiness They fear the pain brought by such things as marriage, raising children, professional achievement, religious commitment（承担的义务），self-improvement．
Ask a bachelor（单身汉）why he refuses marriages even though he finds dating to be less and less satisfying, if he’s honest he will tell you afraid of making a commitment．For commitment is in fact painful．The single life is filled with fun, adventure, excitement．Marriage has such moments, but they are not its most unusual features．
Couples with baby children are lucky to get a whole night’s sleep or a three-day vacation．I don’t know any parent who would choose the word fun to describe raising children．But couples who decide not to have children never know the joys of watching a child grow up or of playing with a grandchild．
Understanding and accepting that true happiness has noting to do with fun is one of the most liberating realizations．It liberates（解放）time; now we can devote more hours to activities that can increase our happiness．It liberates money: buying that new car or those fancy clothes that will do nothing to increase our happiness now seems pointless．And it liberates us from envy: we now understand that all those who are always having so much fun actually may not be happy at all．
48．Raising children, in the author’s opinion, is________．
A．a duty we should have to perform      B．a thankless job
C．a source of pain that can’t be avoided    D．a rewarding task
49．To understand what true happiness is one must________．
A．have as much fun as possible during ones lifetime
       B．make every effort to free oneself from pain
C．put up with pain in all conditions
D．be able to tell happiness from fun
50．What is the writer trying to tell us?
A．One must know how to get happiness
B．Happiness often goes hand in hand with pain
C．It is important to make commitments
D．Pain usually leads to happiness

C

       The way people hold to the belief that a fun-filled, painfree life equals happiness actually reduces their chances of ever getting real happiness．If fun and pleasure are equal to happiness then pain must be equal to unhappiness．But in fact, the opposite is true: more often than not things that lead to happiness is connected with some pain．

       As a result, many people avoid the very attempts（尝试）that are the source of true happiness They fear the pain brought by such things as marriage, raising children, professional achievement, religious commitment（承担的义务），self-improvement．

       Ask a bachelor（单身汉）why he refuses marriages even though he finds dating to be less and less satisfying, if he’s honest he will tell you afraid of making a commitment．For commitment is in fact painful．The single life is filled with fun, adventure, excitement．Marriage has such moments, but they are not its most unusual features．

       Couples with baby children are lucky to get a whole night’s sleep or a three-day vacation．I don’t know any parent who would choose the word fun to describe raising children．But couples who decide not to have children never know the joys of watching a child grow up or of playing with a grandchild．

       Understanding and accepting that true happiness has noting to do with fun is one of the most liberating realizations．It liberates（解放）time; now we can devote more hours to activities that can increase our happiness．It liberates money: buying that new car or those fancy clothes that will do nothing to increase our happiness now seems pointless．And it liberates us from envy: we now understand that all those who are always having so much fun actually may not be happy at all．

48．Raising children, in the author’s opinion, is________．

       A．a duty we should have to perform       B．a thankless job

       C．a source of pain that can’t be avoided    D．a rewarding task

49．To understand what true happiness is one must________．

       A．have as much fun as possible during ones lifetime

       B．make every effort to free oneself from pain

       C．put up with pain in all conditions

       D．be able to tell happiness from fun

50．What is the writer trying to tell us?

       A．One must know how to get happiness

       B．Happiness often goes hand in hand with pain

       C．It is important to make commitments

       D．Pain usually leads to happiness

D

       It is hard to predict（预言）how science is going to turn out, and whether it is really good science, it is impossible to predict．If the things to be found are actually new, they must be unknown in advance．You cannot make choices on this matter．You either have science or you don’t and if you have it you have to accept the surprising and disturbing pieces of information, along with the neat and useful bits．

       The only solid piece of scientific truth about which I feel totally confident is that we don’t know enough about nature．Indeed, I regard this as the major discovery of the past hundred years of biology．It is, in its way, a clear piece of news．It would have amazed the brightest minds of the 18th century to be told by any of us how little we know and how strange the way ahead seems．In earlier times, they either pretended to understand how things worked or simply made up stories to give answers．Now that we have begun exploring seriously, we are catching sight of how huge the questions are, and how far from being answered．Because of this, we are sorry．It is not so bad being ignorant（无知的）if you are totally ignorant; the hard thing is knowing in some details 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．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．

51．Acoording to the writer, really good science________．

       A．would surprise the brightest minds of the 18th  century．

       B．will help people to make the right choice in advance

       C．will produce results which cannot be predicted

       D．will bring about disturbing results

52．It can be inferred from the passage that scientists of the 18th century________．

       A．thought that they knew a great deal and could deal with most problems of science．

       B．knew that they were ignorant and wanted to know more about nature

       C．were afraid of facing up to the realities of scientific research

       D．did more harm than good in man’s understanding of nature

53．Which of the following is NOT mentioned about scientists in earlier times?

       A．They falsely declared to know all about nature．

       B．They did not believe in results from scientific observation．

       C．They paid little attention to the problems they didn’t understand．

       D．They invented false rules to explain things they didn’t understand．

54．What is the writer’s attitude towards science?

       A．He is sorry because of the ignorance of scientists．

       B．He is delighted because of the latest scientific findings．

       C．He is doubtful because of the great difficulties in scientific research．

       D．He is confident though he knows well the great difficulties in scientific research．

55．The writer believes that sooner or later________．

       A．man can’t deal with all the problems he can find because of the limits of human knowledge．

       B．man can find solutions to whatever questions concerning nature he can think up

       C．questions concerning nature are outsiede the field of scientific research

       D．man can think up all the questions and answer them all．