[外语类试卷]大学英语六级模拟试卷9及答案与解析.doc
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1、大学英语六级模拟试卷 9及答案与解析 一、 Part I Writing (30 minutes) 1 For this part, you are allowed 30 minutes to write a short essay entitled Write an English Diary. You should write at least 150 words. 二、 Part II Reading Comprehension (Skimming and Scanning) (15 minutes) Directions: In this part, you will have 15
2、minutes to go over the passage quickly and answer the questions attached to the passage. For questions 1-4, mark: Y (for YES) if the statement agrees with the information given in the passage; N (for NO) if the statement contradicts the information given in the passage; NG (for NOT GIVEN) if the inf
3、ormation is not given in the passage. 2 Space Travel in the Future Space flight may be about to undergo a transformation far more radical than anything planned by national or international space agencies. In the next fifteen years or so, there could be a fleet of fifty space-planes carrying a millio
4、n people into orbit about the Earth each year, at $10,000 per head. A prototype of space plane could be up and flying within five or six years. Perhaps surprisingly the main obstacles to realizing this dream are neither technical nor commercial. Space transportation is expensive and risky at present
5、 because all launchers so far have used large throw-away components that are based on ballistic missile technology. But the technology already exists for a prototype of a fully reusable, aero-plane-like launcher, and its development costs need only be equivalent to about two space shuttle flights(ab
6、out $1,000 million). The cost per prototype space-plane flight would be about 1 percent of the cost in the space shuttle. Costs that low will not be achieved without several years of operating experience and continuous development to create heat shields and rocket motors that meet the usual airliner
7、 standards of long life and low maintenance costs. According to recent market research in Japan, more than a million people a year would be prepared to pay such a price for a brief visit to a space station. If correct, this level of space tourism would provide the sort of commercial incentive and op
8、erating experience needed to achieve airliner standard. However, space policy is so dominated by politics that more than sound engineering and commercial arguments will be needed to transform a high-cost industry into a low-cost one. Many aviation engineers in 1961, was as a member of a space-planes
9、 to be feasible over thirty yeas ago. (My first job, starting in 1961, was as a member of a space-plane design team.) They were not developed primarily because the main player in the filed, NASA, because preoccupied with its part in the Cold War and locked into a ballistic missile mindset. As a resu
10、lt, NASA has not encouraged studies of space-planes that could be built using existing technology and tends to view predictions such as those outlined above as far-fetched. How then can the transformation be brought about? Four recent events should between them trigger the required overthrow of the
11、mindset. The first components have been manufactured for the International Space Station and NASA, in conjunction with the Space Transportation Association, has begun the first official study the Orbital Science Corporation and the Rockwell International Corporation, for development of the X-34 laun
12、cher. The X-34 has a reusable lower stage and an expendable upper stage, and is designed to reduce the cost of launching small satellites. Unpiloted and looking rather like a large, fat fighter aero-plane, it is launched from a converted Boeing 747. Having released the upper stage at about one half
13、satellite speed, the rocket -powered lower stage glides back to base and lands. Following inspection, maintenance and refueling, the lower stage will be ready for the next flight a few days later. The first orbital test flight is scheduled for just two and a half years from now. In April 1995, NASA
14、places competitive study con- tracts with Lockheed, McDonnell Douglas and Rockwell for the X-33 demonstrator, which is tended to lead to an unpiloted single-stage-to-orbit launcher. When the implications of such projects become widely appreciated, the case for a new and realistic way ahead for space
15、 will become overwhelming. While the X-34 cannot be described as a true space- plane, since it has an expendable upper stage, if it is successful it will provide unassailable evidence for the feasibility of a true space-plane. A piloted two-stage space-plane using existing technology will then be se
16、en as among the all - time best aerospace buys. Its development cost would be recovered by saving just three shuttle flights. It is not so much that the space-plane would be especially efficient, but rather that the shuttles are especially inefficient, and that NASA has so far succeeded in playing d
17、own this fact. British companies have proposed designs that are more suitable than the X-33 and X-34, but they are handicapped by a government, which would not prepare to invest in even seed corn studies of new launchers. The largest new space project planned at present is the International Space St
18、ation. The estimated cost is about $20 billion plus about the same again in launch costs, including some 28 shuttle flights. A large part of the cost is due to the complexity of integrating the various modules from the US, Canada, Europe, Japan, and Russia. If these modules were adapted to be flown
19、separately as independent small space stations, not only would costs come tumbling down, but the science would be far better because each disciplinebe it astronomy, atmospheric science, Earth observation or microgravity researchhas a different optimum orbit. The resulting constellation of small spac
20、e stations would require more frequent servicing and supply flights than the single large one. This would not be affordable using the shuttle but would be with the new space-plane. The total cost could be reduced by at least 80 per cent to less than $8 billion. Then all that is needed is for some en
21、trepreneur to realize that the best way to finance new space-plane and space stations is to carry tourists. And before too long a million people a year will be taking their once-in-a-lifetime, round-the-world cruise in orbit. 2 In 1961, NASA has encouraged studies of space-planes that could be built
22、 using existing technology. ( A) Y ( B) N ( C) NG 3 Space policy is dominated by polities. ( A) Y ( B) N ( C) NG 4 Four recent events should between them trigger the required overthrow of the mindset. The first components and second components have been manufactured for the International Space Stati
23、on. ( A) Y ( B) N ( C) NG 5 British companies have proposed designs that are more suitable than the X-33 and X-34, but the government does not support it. ( A) Y ( B) N ( C) NG 6 _ countries have worked together to build the International Space Station. 7 The main difficulties of space flight are ne
24、ither_ nor_. 8 The best way to finance new space-planes and space stations is_. 9 The large new space project planned at present is the_. 10 The X-34 has a reusable lower stage and an expendable upper, the goal of designs is_. 11 In April 1995, makes the_. Section A Directions: In this section, you
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