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图示桁架中,杆1的轴力为:

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未知题型
In the United States, a person can take credit only for what he has accomplished by himselF.Americans get no credit whatsoever for having been born into a rich or privileged family. (In the United States, that would be considered ―an accident of birth .) Americans pride themselves in having been born poor and, through their own hard work, having climbed the difficult ladder of success to whatever level they have achieved —all by themselves. The American social system has, of course, made it possible for Americans to move, relatively easily, up to the social ladder, whereas this is impossible to do in many other countries. The ―self -made man or woman is still very much the ideal in present-day AmericA.
Americans believe that competition brings out the best in any individual. Consequently, the foreign visitor will see competition being fostered in the American home and in the American classroom, even at the youngest age levels. You may find the value placed on competition among individuals. But Americans teaching in Third World countries find the lack of competitiveness in a classroom situation equally distressing ( 令人苦恼的). They soon learn that what they had thought to be one of the universal human characteristics represented only a peculiarly American (or Western) valuE.
Americans, valuing competition, have devised an economic system to go with it – free enterprise (自由企业制). Americans feel very strongly that a highly competitive economy will bring out the best in its people and ultimately, that the society which fosters competition will progress most rapidly. If you look for it, you will see evidence in all areas – in all fields as diverse as medicine, the art, education, and sports – that free enterprise is the approach most often preferred in AmericA.
What does the author mean by saying ―self -made man or woman is still very much the ideal in present-day America?
A.Americans no longer respect those who are born rich as they used to.
B.Americans still respect those who have climbed up the social ladderthrough hard work.
C.Americans think that an ideal man or woman should be born poor.
D.Americans think that only the self-made man or woman is worthy ofrespect.
What does the author think of the American social system?A.It is a system that does not favor those who are born rich.
B.It is a system that makes social climbing very difficult, if not impossiblE.
C.It makes it comparatively easy for the poor to move up the social ladder.
D.It is the best system possible in the worlD.
Americans teaching in Third World countries found that _____.A.competition is a unique American (or Western) valuE.
B.competition must be fostered in the classroom for success in business.
C.cooperation is more important than competition in bringing about progress.
D.competition is one of the universal human characteristics.
We can infer from the passage that free enterprise is _____.A.an economic system allowing free competition among business
B.a belief that competition brings out the best in any individual
C.an attitude that values competition rather than cooperation
D.a theory that advocates competition as the source of all progress
Americans would most likely frown at you if you _____.A.tell them you were born poor and had to work with your hands
B.go around telling people that your father is a self-made man
C.tell them that their social system is not necessarily the best
D.complain that you were born poor and had had no opportunities
请帮忙给出每个问题的正确答案和分析,谢谢!
未知题型
What will man be like in the future – in 5, 000 or even 50, 000 years from now? We can only make a guess, of course, but we can be sure that he will be different from what he is today. For man is slowly changing all the timE.
Let us take an obvious examplE.Man, even five hundred years ago, was shorter than he is today. Now, on average, men are about three inches taller. Five hundred years is a relatively short period of time, so we may assume that man will continue to grow taller.
Again, in the modern world we use our brains a great deal. Even so, we still make use of only about 20% of the brain ’s capacity. As time goes on, however, we shall have to use our brains more and more, and eventually we shall need larger ones! This is likely to bring about a physical change tool the head, in particular the forehead, will grow larger.
Nowadays our eyes are in constant usE.In fact, we use them so much that very often they become weaker and we have to wear glasses. But over very long period of time it is likely that man ’s eyes will grow stronger.
On the other hand, we tend to make less use of our arms and legs. These, as a result, are likely to grow weaker. At the same time, however, our fingers will grow more sensitive because they are used a great deal in modern lifE.
But what about hair? It will probably disappear from the body altogether in course of time because it does not serve a useful purpose any longer. In the future, then, both sexes are likely to be bald!
Perhaps all this gives the impression that future man will not be a very attractive creature to look at! This may well be truE.All the same, in spite of all these changes, future man will still have a lot in common with us. He will still be a human being, with thoughts and emotions similar to our own.
The passage tells us about _____.
A.how man’s life will be in the future
B.how future man will look like
C.the fact that man ’s organs will function differently in the future
D.the fact that man is growing uglier as time passes
There is evidence that man is changing _____.A.man has been growing taller over the past 500 years
B.man has got stronger eyes than he ever had
C.man’s hair is getting thinner and thinner
D.man’s limbs are getting weaker because he tends to make less use of them
Man’s forehead will grow larger because _____.A.he will use of only about 20% of the brain ’s capacity
B.the other 80% of his brain will grow in due time
C.he had rather narrow forehead a few hundred years ago
D.he will have to use his brain more and more as time goes on
Future man will probably ______.A.have smaller eyes
B.have larger eyes
C.see better
D.gave to wear better glasses
The reason for believing that future man will be different is that he _____.A.is always
B.never stops changing
C.hopes for a change
D.will live a different life
请帮忙给出每个问题的正确答案和分析,谢谢!
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