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In the past year, a lot has changed in the field of human spaceflight. (46) In January, President George Bush brushed aside the fact that America’s entire space-shuttle fleet was grounded when he announced grandiose plans to put people back on the moon, and then to launch a manned mission to Mars. (47) In June, Burt Rutan, an American aeronautical engineer, showed that human spaceflight was no longer the preserve of governments by sending a man to the edge of space in Space Ship One, a privately financed vehicle that cost about the same to build as a luxury yacht. That was followed in September by Sir Richard Branson, the British entrepreneur behind the Virgin brand, announcing that he had signed a deal with Mr Rutan to work on plans for a fleet of five suborbital vehicles developed from Space Ship One.(48) Now, in the dying days of the year, America’ s Congress has passed a bill that unravels a tangle about who would be responsible for regulating the fledgling industry, and under what terms. (49) The bill also allows passengers to fly on the understanding that this new generation of vehicles may not be as safe as taking a commercial flight between, say, New York and London.The official line from Virgin Galactica, as Sir Richard’ s latest venture is modestly named, is that this coming change in the law makes no practical difference to the firm’s plans, since they do not intend to fly unless they can make their spacecraft as safe as a private jet. But it must surely come as some sort of relief. In any case, Will Whitehorn, director of corporate affairs at Virgin’ s headquarters in London, and soon to become the president of Virgin Galactica, says that work is under way on a mock-up of the interior of a new spacecraft that will hold five passengers. (50) Virgin has already committed $ 20m towards licensing the SpaceShipOne technology from Mr Rutan and his financial backer Paul Allen, a software billionaire. Now, in the dying days of the year, America’ s Congress has passed a bill that unravels a tangle about who would be responsible for regulating the fledgling industry, and under what terms
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In the past year, a lot has changed in the field of human spaceflight. (46) In January, President George Bush brushed aside the fact that America’s entire space-shuttle fleet was grounded when he announced grandiose plans to put people back on the moon, and then to launch a manned mission to Mars. (47) In June, Burt Rutan, an American aeronautical engineer, showed that human spaceflight was no longer the preserve of governments by sending a man to the edge of space in Space Ship One, a privately financed vehicle that cost about the same to build as a luxury yacht. That was followed in September by Sir Richard Branson, the British entrepreneur behind the Virgin brand, announcing that he had signed a deal with Mr Rutan to work on plans for a fleet of five suborbital vehicles developed from Space Ship One.(48) Now, in the dying days of the year, America’ s Congress has passed a bill that unravels a tangle about who would be responsible for regulating the fledgling industry, and under what terms. (49) The bill also allows passengers to fly on the understanding that this new generation of vehicles may not be as safe as taking a commercial flight between, say, New York and London.The official line from Virgin Galactica, as Sir Richard’ s latest venture is modestly named, is that this coming change in the law makes no practical difference to the firm’s plans, since they do not intend to fly unless they can make their spacecraft as safe as a private jet. But it must surely come as some sort of relief. In any case, Will Whitehorn, director of corporate affairs at Virgin’ s headquarters in London, and soon to become the president of Virgin Galactica, says that work is under way on a mock-up of the interior of a new spacecraft that will hold five passengers. (50) Virgin has already committed $ 20m towards licensing the SpaceShipOne technology from Mr Rutan and his financial backer Paul Allen, a software billionaire. ) In January, President George Bush brushed aside the fact that America’s entire space-shuttle fleet was grounded when he announced grandiose plans to put people back on the moon, and then to launch a manned mission to Mars.
两根细长杆，直径、约束均相同，但材料不同，且E1=2E2，则两杆临界应力之间的关系为( )。
SECTION A In this section you will hear a mini-lecture. You will hear the lecture ONCE ONLY. While listening, take notes on the important points. Your notes will not he marked, but you will need them to complete a gap-filling task after the mini-lecture. When the lecture is over, you will be given two minutes to check your notes, and another ten minutes to complete the gap-filling task on ANSWER SHEET ONE. Use the blank sheet for note-taking. Britain The majority of British people work in (1) industries. About 20% work in (2) and 5% in construction. Do-It-Yourself, or D-I-Y as it is known, is a popular (3) activity in Britain. Many people spend their weekends carrying out various improvements to their homes. Other people lovingly tend their gardens. A quarter of the population is involved in some sort of (4) work, helping others without being paid. Britain is an (5) society, and people are often tolerant of each other. Food served in pubs has also become more (6) in recent years. Newspapers in Britain can be divided into two main types: popular and (7) . (8) begins at the age of 5 and finishes at the age of 16. In Britain nowadays many non-married people (9) without getting married. British humor is frequently of a sarcastic kind, but it should not be taken literally or seriously. The British person is simply " (10) ."
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