d Motion Analysis Camera capable of taking up to 40,500 digital frames per second. The Kodak 4540 records the images to DRAM memory allowing immediate play back of the recorded images for viewing, recording to videotape or to PC for analysis. The Copper Vapor laser acts as a short duration flash emitting pulses of only 30 nanoseconds in duration in full synchronization with the frame rate of the camera The flashes have the effect of reducing the exposure time of the camera, thus removing image blur due to the high speed of the subject under view, whilst maintaining image contrast due to the high intensity of the laser light. Another feature of the system is the ability to focus down the light. This has two benefits. The first is the ability to make laser light sheets for the 2 dimensional illumination of 3 dimensional subjects. This technique has great benefit when used to map the air flow into the combustion chamber of a running model engine. Not only can the air-flow be mapped but the progress of the flame front growth during the combustion cycle. The second is the ability to shine the laser light down a fiber optic cable. This aids in the illumination of areas of the running engine very difficult to access by normal optics. This has been particularly useful in the study of air motion in a variety of combustion system concepts.
The group plans to use the Copper Vapor laser to improve the ability of the technique to see these vibrations and therefore allow a better understanding of the cause of them. The technique could also applied to look at the airbag enclosure as it tears and composite materials under dynamic crush testing.
6. How many uses of the laser-based analysis system does the author want to show us?
[A] One [B] Two [C] Three [D] Much more than three
7. Which of the following does the High Speed Imaging system comprise ________.
[A] an Oxford Lasers LS20 Copper Vapor laser
[B] 4540 Digital High Speed Motion Analysis system
[C] DRAM memory allowing immediate play back of the recorded images for viewing
[D] a High Speed Imagining Division of Oxford Lasers LTD.
8. Which of the following is the main advantage of the laser flashes?
[A] Keeping image contrast [B] getting rid of image blur
[C] Increase the intensity of light [D] All is said in A, B, and C
9. Which of the following uses is NOT TRUE according to the passage?
[A] The laser light can help to make the three dimensional bodies look as if they were of two dimensions.
[B] The air-flow can thus be made easier to be mapped with the laser.
[C] The turning speed of the combustion engine can be accelerated by using vapor laser.
[D] The exposure time of the camera can be reduced by the laser flashes.
10. Which of the following can be the best title of the passage?
[A]At the Speed of Light
[B] A High Speed Imagining Division Made by the Oxford Lasers LTD.
[C] A Miraculous Application of Laser in Testing the Internal Combustion Engine
[D] Automobile research and Laser Technology
答案： D A D C C
资料3：
When I was a little girl, my brothers and I collected stamps for many years. My mother didn't use to work during the week, but she worked in the post office near our house on Saturdays, and she used to bring home all the new stamps as soon as they were issued.
On the day of the World Cup football final in London in 1966, we were very excited because England were playing West Germany in the final. When we were having lunch, my mother told us to go to the post office straightaway after the match if England won, but she didn't tell us why. At 2 o'clock my mother went back to work as usual, while the rest of the family were watching the football on TV at home. Although she wasn't watching the match, she was listening to it on the radio.
England won 4:2 and so my brothers and I ran to the post office. As we burst in, my mother was standing behind the counter. She was waiting to sell us a very special limited edition with ENGLAND WINNERS on each stamp. We were over the moon.
We still have it today, and perhaps it is worth a lot of money.
11. This passage mainly tells us __________.
A. the author and her brother used to like stamps very much
B. the author had a very kind mother
C. the author and her brother had an unforgettable experience in collecting stamps
D. their mother used to support them by working in the post office
12. According to the passage, her mother worked in the post office ________.
A. during the week B. on Saturdays C. on Sundays D. for six days
13. Their mother told them to go to the post office straightaway after the match if England won, but she didn't tell them why. Why do you think she did that?
A. She wanted to give them a surprise.
B. She doubted if she would get the stamps.
C. She forgot to do that.
D. She thought it unnecessary to tell them the reason.
14. What does the sentence "We were over the moon." mean?
A. We jumped high. B. We were extremely happy about it.
C. We watched the moon for a long time.
D. We couldn't sleep the whole night.
15. What is the best title for this passage?
A. My Childhood.
B. My Mother.
C. A Precious Stamp.
D. A Memorable Experience in Collecting Stamps.
答案：.C B A B D
资料4：
You stare at waterfall for a minute or two, and then shift your gaze to its surroundings. What you now see appears to drift upward.
These optical illusions occur because the brain is constantly matching its model of reality to signals from the body’s sensors and interpreting what must be happening—that your brain must have moved, not the other; that downward motions is now normal, so a change from it must now be perceived as upward motion.
The sensors that make this magic are of two kinds. Each eye contains about 120 million rods, which provide somewhat blurry black and white vision. These are the windows of night vision; once adapted to the dark, they can detect a candle burning ten miles away.
Color vision in each eye comes from six to seve
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