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70天攻克考研英语阅读 DAY21

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 ground stationthe ground stationthe ground constant

  the ground antenna    the grounded circuit

  the power station      the ground station

  the ground troops      the ground floor

  the ground station      the police station

  the railway station    the ground station

  the battle ground      the atomic station

  the ground station      the ground control

  the television station    the ground station

  the pumping station    the sentry station

  the ground station      the central station

  the ground distance    the ground station

  the ground station      the station location

  the space station      the ground station

  Finishing Time:  Total Reading Time:

  Check each line very carefully. The key phrase appears 10 times.

  Teacher in the SkyOn May 30,1974, the worlds first direct broadcast satellite was sent into orbit from Cape Kennedy in the state of Florida. Thus began a new era, one of direct communication by satellite with inexpensive home receivers. Named the ATS6, the direct broadcast satellite was the realization of a concept for a satellite communications network that was first proposed in 1945.

  How is the ATS6 used? A visit to a small classroom in Tuba City, Arizona, will give us an idea of the practical application of direct communication by satellite in an educational situation. A group of students wait for their lesson from space. Besides the group in Tuba City, approximately 5,000 students in eight states and 55 other isolated communities located in the southwestern area of the U.S. are also waiting for their lesson from space.

  The teacher makes the necessary adjustments on the television receiver and the students turn their attention to the TV screen. The first lesson, "Planning a Career in 20th Century America,"is about to begin. As the image, beamed live from ATS6, forms on the screen, 56 widely separated classrooms become one - electronically.

  On the roof of the Tuba City school and on other roofs throughout the southwestern United States a threemeter high fiberglass antenna is pointed toward the southern sky and the satellite, which is in stationary orbit 36,000 kilometers above the Galapagos Islands.

  The ATS6 is the first spacecraft to be equipped with a ninemeter antenna. Oriented toward the Earth from an altitude of 36,000 kilometers, the antenna focuses the wide range of electromagnetic frequencies that ATS6 can transmit toward very small stations on the ground. The antenna can also collect relatively weak transmissions from the ground stations. Thus, the cost and complexity of ground equipment is lowered and its availability to average users is increased.

  In order to take full advantage of the capabilities of ATS6, a number of U.S. government agencies worked together to conceive and implement cooperative projects for direct experimental broadcasts. In the main, the plans called for broadcasts of educational and health information to small communities spread across 1,485,000 square kilometers of the United States. Most of these communities had no television programs at all until the ATS6 supplied them.

  Other experiments ranged from teacher training via direct schooltoschool satellite conferences to the exchange of health data between veterans hospitals via individual hospital antennas. ATS6 was being used essentially 24 hours a day in such exploration of the uses, techniques, and problems of this revolutionary tool.

  Besides the satellite, the principal component of the new satellite education program is the small, specially designed, lowcost ground station. The ground stations are completely solidstate in construction, very simple to operate and maintain and modular in design. The interchange ability of pacts, plugin maintenance, and modular design were developed by four U.S. corporations and are the heart of lowcost access for all users to direct satellite transmissions.

  ——from Short Readings in Science

  Time:  494 words=  wpm

  MinutesEXERCISESⅠ。 READING COMPREHENSION

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

  1. The idea of the practical application of direct communication by satellite was first introduced .

  A. in 1974B. when ATS6 was launched from Cape Kennedy

  C. in 1945       D. by a small class in Tuba City

  2. In a small classroom in Tuba City, students are waiting for their lesson from space - a lesson taught by a teacher in .

  A. the ATS6B. a space station

  C. the TV studio in Tuba City

  D. a faroff place, the signals of which are transmitted by the ATS6

  3. The word "teacher" in the first line of paragraph 3 most probably refers to the one who .

  A. is only responsible for coaching the students of his class

  B. is to give the lesson

  C. is responsible for adjusting the TV receiver

  D. is in a communications satellite

  4. As the lesson is broadcast live, 56 separated classes become one in the sense that they all .

  A. listen to the same teacher

  B. live in the southwestern part of the U. S.

  C. major in the same subject

  D. learn their lessons at the same place

  5. We can learn from the passage that the Galapagos Islands are to the  of the Southwestern United States.

  A. northB. southC. northeastD. northwest

  6. It can be inferred that the ATS6 .

  A. circles the earth at a speed faster than the earths rotation speed

  B. orbits the earth at the same speed as the earths rotation speed

  C. goes around the earth at a speed lower than the earths rotation speed

  D. revolves around the earth at an irregular speed

  7. The antenna on ATS6 can play either of the following two roles when needed: .

  A. to send out electromagnetic waves toward ground stations, or receive signals from them

  B. to reduce the cost and complexity of ground equipment, or increase the availability of satellite communications to average users

  C. to collect relatively weak transmissions from the ground stations or convert the electromagnetic signals into pictures

  D. to focus the wide range of electromagnetic frequencies transmitted toward ATS6 on the ground or send out relatively weak signals toward the ground stations

  8. The ATS6 was working on a 24hour basis, broadcasting  programs.

  A. commercial         B. experimental

  C. educational and healthinformationD. recreational

  9. This passage is mainly about .

  A. the ATS6 and its ground stations B. experiments on the ATS6

  C. multipurpose communication by the ATS6

  D. the direct communication by satellite in educational departments

  Ⅱ。 CONTEXTUAL REFERENCE

  Read the following article and figure out the meaning of the words in italics using the context given and wordbuilding skills.

  Artificial satellites can be used for various purposes. The following are some different types of satellites.

  1. Weather Satellites: These satellites help in forecasting the weather. They contain special cameras which can photograph the formation of clouds all over the Earth from space. Scientists are able to forecast the weather by studying these photographs.

  2. Communications Satellites: These satellites orbit at a much higher level than weather satellites. They contain special instruments which can pass on or relay radio and television programs or telephone messages from one station to another.

  3. Scientific Satellites: These satellites carry scientific instruments which can gather various information about space. Such satellites have been able to send back information about radiation, meteors and magnetism in space.

  4. Probes: These are unmanned spacecraft which scientists send to the moon and the planets. They send back information and closeup photographs of these places.

  The information sent back by artificial satellites helped scientists to send manned spacecraft safely into space. This created a new group of explorers - spacemen.

  ——from Basic English Drills B. I. p. 155

  Ⅲ。 CLOZE

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

  Most Powerful INTELSAT

  A new communications satellite, with greater capacity than any previous civilian comsat (民用通讯卫星 ), has been launched into geosynchronous orbit (地球同步轨道)。 INTELSAT V is the first of   1        will be a network     2     nine such spacecraft. Boosted     3     orbit atop an AtlasCentaur     4     from Kennedy Space     5     in Florida,it will be locked in     6     22,300 miles 7     the Atlantic Ocean. The nine INTELSAT V satellites will eventually     8     three oceans: the Atlantic,     9     and Indian. Built by Ford Aerospace and Communications Corp., the new satellite     10     twice the capacity of the INTELSAT IVA now in     11. It will provide 12,000  12     telephone voice channels and  two colorTV channels.

  INTELSAT stands     13     the International Telecommunications     14     Organization, a 105member     15     system that now     16     more than a billion people and     17     twothirds of all     18     , transoceanic communications traffic - TV,     19, teletypewriter messages, and highspeed     20     transmissions.

  One important change in INTELSAT V is that it is a nonspinning, threeaxisstabilized design. Spinstabilized satellites, because they are constantly rotating, present only about a third of the surface of their solar panels (太阳能电池板) to the sun at one time. But a nonspinning satellite can orient its solar panels to the sun all the time, thus easing the design of the power supply. The solar "wings" of INTELSAT V stretch 50 feet from tip to tip and carry 17, 576 cells.

  ——from Popular Science, March 1981

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