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What are those of us who have chosen careers in science and engineering able to do about our current problems First, we can help destroy the false impression that science and engineering have caused the current world trouble. On the contrary, science and engineering have made vast contributions to better living for more people. Second, we can identify the many areas in which science and technology, more considerably used, can be of great service in the future than in the past to improve the quality of life. While we can make many speeches, and pass many laws, the quality of our environment will be improved only through better knowledge and better application of that knowledge. Third, we can recognize that much of the dissatisfaction we suffer today results from our very successes of former years. We have been so greatly successful in attaining material goals that we are deeply dissatisfied that we cannot attain other goals more rapidly. We have achieved a better life for most people, but we are unhappy that we have not spread it to all people. We have reduced many sources of environmental disasters, but we are unhappy that we have not conquered all of them. It is our raised expectations rather than our failures which now cause our distress. Granted that many of our current problems must be cured more by social, political, and economic instruments than science and technology, yet science and technology must still be the tools to make further advances in such things as clean air, clean water, better transportation, better medical care, more adequate welfare programs, purer food, conservation resources, and many other areas. The author thinks that science and technology ______.
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[听力原文]6-8M: Have you ever heard of a machine that sells ticketsW: Yes. I’ve seen them in bus and subway stations.M: But I mean a single machine that sells all kinds of tickets, located in public areas just like an ATM.W: What do you mean by "all kinds of tickets"M: Air tickets, bus tickets, subway tickets, railway tickets, tickets for tourist attractions, and so on.W: Well, that sounds fantastic! But is it easy to useM: Very simple. Yesterday I bought my air ticket for my trip to Shanghai from such a machine.W: How did you do itM: Well, I first pushed the "Air Ticket" button, typed in my destination and the time I wanted for my flight, and several choices appeared on the screen.W: What kind of choicesM: Flight numbers from different airlines that were suitable for me.W: I see. What did you do thenM: I made my choice of flight and put in my bank card, and guess what had happenedW: WhatM: In less than a minute, I got my air ticket. Where did the man get his air ticket for his trip to Shanghai（）
营运资本是流动资产与流动负债之差，营运资本的多少可以反映偿还短期债务的能力，相对于流动比率而言，更适合企业之间以及本企业不同历史时期的比较。( )
Teachers need to be aware of the emotional, intellectual, and physical changes that young adults experience. And they also need to give serious (21) to how they can be best (22) such changes. Growing bodies need movement and (23) , but not just in ways that emphasize competition. (24) they are adjusting to their new bodies and a whole host of new intellectual and emotional challenges, teenagers are especially self-conscious and need the (25) that comes from achieving success and knowing that their accomplishments are (26) by others. However, the typical teenage lifestyle is already filled with so much com petition that it would be (27) to plan activities in which there are more winners than losers, (28) , publishing newsletters with many student-written book reviews, (29) student artwork, and sponsoring book discussion clubs. A variety of small clubs can pro- vide (30) opportunities for leadership, as well as for practice in successful (31) dynamics. Making friends is extremely important to teenagers, and many shy students need the (32) of some kind of organization with a supportive adult (33) visible in the back-ground. In these activities, it is important to remember that the young teens have (34) attention spans. A variety of activities should be organized (35) participants can remain active as long as they want and then go on to something else without feeling guilty and with- out letting the other participants down.
Teachers need to be aware of the emotional, intellectual, and physical changes that young adults experience. And they also need to give serious (21) to how they can be best (22) such changes. Growing bodies need movement and (23) , but not just in ways that emphasize competition. (24) they are adjusting to their new bodies and a whole host of new intellectual and emotional challenges, teenagers are especially self-conscious and need the (25) that comes from achieving success and knowing that their accomplishments are (26) by others. However, the typical teenage lifestyle is already filled with so much com petition that it would be (27) to plan activities in which there are more winners than losers, (28) , publishing newsletters with many student-written book reviews, (29) student artwork, and sponsoring book discussion clubs. A variety of small clubs can pro- vide (30) opportunities for leadership, as well as for practice in successful (31) dynamics. Making friends is extremely important to teenagers, and many shy students need the (32) of some kind of organization with a supportive adult (33) visible in the back-ground. In these activities, it is important to remember that the young teens have (34) attention spans. A variety of activities should be organized (35) participants can remain active as long as they want and then go on to something else without feeling guilty and with- out letting the other participants down.
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