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70天攻克考研英语阅读 DAY17

2006-7-28 01:04  

  Increasing reading speed

  Directions: Do the phrase recognition drill below. Quickly underline or mark the key phrase every time it appears in the columns. Try to finish in 10 seconds or less by reading down the column, not left to right.

  Starting Time:

  Key phrase: the space shuttlethe space shuttlethe space station

  the space rocket      the space shuttle

  the space shuttle      the nuclear rocket

  the shuttle catcher      the space shuttle

  the space biology      the space charge

  the speed reducer      the space shuttle

  the space shuttle      the camera shutter

  the space heater      the space capsule

  the space shuttle      the space current

  the space flight      the space shuttle

  the space travel      the shuttle service

  the shuttle carrier      the space shuttle

  the space shuttle       the nuclear shuttle

  Finishing Time:  Total Reading Time:

  Check each line very carefully. Key phrase appears 10 times.

  SpaceAge ArcheologyIts a strange partnership, but a very effective one: Satellites and spaceshuttlecarried radar are helping archeologists.  How? By "seeing" through sand or through treetops to locate important archeological sites.

  It seems unusual, and it is. After all, the traditional tools of archeologists are shovels and picks. But tradition is giving way to high technology, and  its making the archeologists work and time far more productive.

  Take, for example, the second 1981 flight of the Space Shuttle Challenger. During that mission, a powerful, experimental radar was pointed at a lifeless stretch of desert in Egypt called the Selima Sand Sheet (part of the Sahara Desert)。 Much to everyones surprise, the radar penetrated through the sand to the harder rock beneath. On the surface, there is little indication that Africas Sahara Desert was ever anything but a desert. When the archeologists studied the radar images, they saw what seemed to be impossible: there was sandburied landscapes that were shaped by flowing water, traces of ancient riverbeds. In some places the riverbeds appeared to be over nine miles wide, far wider than most sections of the presentday Nile River. Today, the area is one of the hottest, driest desert in the world.

  Archeologists dug pits along the old river banks and found clues to the past: streamrounded pebbles, StoneAge axes, broken ostrich eggshells, and the shells of land snails. The archeologists were quite pleased with these findings. For years, theyd been finding stone axes scattered through the desert, and couldnt understand why. Now we know that early humans were living on the banks of old rivers, and left their beautiful tools behind. Some are so sharp that you could shave with them.

  More recently, Landsat 4, a special Earthmapping satellite, aided in the discovery of ancient Mayan ruins in Mexico. Landsat can, with the help of falsecolor imagery, "see through" the dense jungle canopy that now covers much of the area. Landsat maps variations in reflected light from the ground, including infrared (invisible heat) radiations. So exact are the measurements of these reflected lights that a computer can identify living objects and assign them certain colors, while giving nonliving objects contrasting colors. Researchers looked for square or rectangular shapes that suggested twototwentyacre enclosures where Mayans stored fresh water. Armed with these maps, a fiveperson expedition took to the air in a helicopter.

  By the end of the second day, the team hit paydirt: they found a stretch of walled fields that expedition members said look like "old New England fences." They just go on, nonstop, for 40 miles. Later in the week, an ancient village surrounded by walled fields was pinpointed, as was the "lost" city of Oxpemul, once found in the early 1930s but quickly reclaimed by the jungle. The Mayan culture reached its peak in 250 A.D. and flourished for another 600 Years. The archeologists were elated with the findings, which made them able to map the extent of the Mayan civilization in the Yucatan in about five days. Working on foot, it would have taken at least 100 years.

  Pick and shovelwielding scientists, move over. The spaceage archeologists are here with new tools: "eyes" in the sky!

  ——from Science World, Nov. 1, 1985

  Time:  530 words =  wpm

  Minutes

  EXERCISESⅠ。 READING COMPREHENSION

  Select the answer which is most accurate according to the information given in the passage.

  1. In discovering important archeological sites, archeologists are gaining help from     .

  A. spaceshuttlecarried radarB. satellites

  C. satellites and air vehicles   D. both A and B

  2. The traditional tools of archeologists are shovels and picks, which are now .

  A. paving the way for the application of high technology

  B. being replaced by high technology

  C. offering assistance to high technology

  D. making the archeologists work and time far more efficient

  3. No one had expected that  before studying the radar images.

  A. the radar would reach the harder foward the rock below the sand

  B. the radar would be pointed toward the Selima Sand Sheet

  C. there would be anything but an eternal desert in Sahara

  D. the whole ancient riverbed would be much wider than the Nile River

  4. What was seemingly impossible yet true?

  A. That the landscape was formed by streams beneath the sand.

  B. That the landscape was an underground river.

  C. That the landscape was ancient riverbeds.

  D. That the landscape was shaped by flowing water during the rainy seasons of the desert.

  5. The finding of streamrounded pebbles and StoneAge axes along the ancient river banks .

  A. revealed a riddle as to why stone axes had been found in many places of the Sahara desert

  B. unfolded the secret as to why early humans left their beautiful tools behind

  C. explained the extinction of most species of animals in sahara

  D. both A and C

  6. Which of the following is meant by the author?

  A. Since the infrared radiations of nonliving objects are greater than those of living things, the colors assigned to them are darker than those assigned to living things.

  B. By reading variations between visible and infrared lights reflected from the ground, a computer can distinguish living things from nonliving objects.

  C. The mapping of variations in reflected light (including infrared) from different objects on the ground was so precise that a computer could tell living things from nonliving things.

  D. A computer can tell living things from nonliving things simply by the different colors that represent them.

  7. In the sentence, "They just go on, nonstop, for 40 miles" (paragraph 6), the pronoun "they" refers to

  A. old New England fences   B. the stretch of walled field

  C. the expedition members   D. none of them

  8. Which of the following sentences is closest in meaning to the sentence, "Working on foot, it would have taken at least 100 years" (paragraph 6)?

  A. Without the aid of the helicopter, the archeologists would have spent at least 100 years.

  B. If they had not gotten a car to help them work,they would not have finished the task so soon.

  C. But for the help of Landsat 4, the archeologists would have taken a much longer time to accomplish the work.

  D. Both A and B.

  Ⅱ。 CONTEXTUAL REFERENCE

  Guess the meaning of the following words in italics using reading techniques.

  1. In fact, he was the one who invented the name of a new branch of science - exobiology. Exobiology is defined as the study and the search for possible life forms in outer space.

  2. The position of places on the Earths surface are given in latitude and longitude. These are imaginary circles running round the earth. Lines of latitude run horizontally and are parallel to the Equator. Lines of longitude run vertically. They converge at the North and South Poles.

  3. A lunar eclipse occurs at full moon when the moon moves through the shadow of Earth. Since the moon shines only by reflected sunlight, we see the moon gradually darken as it enters the shadow.

  4. A solar eclipse occurs when the moon passes directly between Earth and Sun, blocking our view of the sun. If the moon completely covers the sun, the eclipse is total, but if the moon covers only part of the sun, the eclipse is partial.

  5. Cosmology, the study of the nature, origin, and evolution of the universe, tests our confidence that we can understand nature. In cosmology we try to answer the big questions: How did the universe begin? How big is it? Does it have an edge? Will the universe ever end?

  6. In 1967 neutron stars were finally discovered in an unexpected way - as pulsars, or pulsating radio sources. Most radio sources in the sky emit a hiss of radio noise, like static on a radio. Pulsars emit their radiofrequency radiation in regular bursts, or pulses. Listen to them, and they tick each time a pulse comes through. It is now generally agreed that these pulsars are neutron stars.

  Ⅲ。 CLOZE

  Complete the following passage by filling in the blanks with appropriate words.

  Passenger Plane to Outer Space

  NASA(National Aeronautic and Space Administration) is seeking funds for a research program to develop a 300to500passenger hypersonic (高超音速的) aircraft that would take off and land like an airplane and be capable of flying into orbit.     1     comparison, todays space 2     would seem     3     a Model T.

  To reach     4, the aircraft would need to attain the     5     speed of Mach [马赫(速度单位)] 12, well     6     the abilities of todays      7     . Hypersonic (高超音速空气动力学) will utilize    8   several different engines, each     9     to operate at a specific speed, or a single     10     integrating several engine types      11     one. The problem is that conventional turbofan engines (涡轮风扇发动机),     12      work well at relatively low     13, are inefficient at supersonic speeds.       14,ramjets [冲压(喷气)发动机], which work efficiently at Mach 3, do not     15     at low velocities. And no engine     16     designed can sustain a speed of Mach 6 and above     17     very long. NASA is     18     a 15year, billiondollar R&D program to     19     these and the myriad (无数的) other 20     of hypersonic flight. It would include tests of a new engine mounted on a missile flying at Mach 12 and operation of an experimental aircraft at Mach 6.

  ——from Science Digest, July 1985

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