Reading for Understanding Three #49A

Thelma Thurstone The McGraw-Hill Companies, Inc.

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  1. If an electric bell is placed in a container from which the air is gradually removed, the sound of the bell becomes fainter until it cannot be heard at all when the air is completely removed. For, unlike light, sound must travel
  2. Your answer:
    at great speeds.
    faster than air.
    through some material substance.
    through electricity.

  3. The range of observation under an optic microscope that can magnify only about fifteen hundred times is limited to objects no smaller than the wavelength of visible light. A beam of electrons, replacing light and focused on an electron microscope that can magnify more than eighty thousand times, increases the range for studying specimens that are
  4. Your answer:
    much smaller than the wavelength of visible light.
    the same length as the waves of visible light.
    much larger than the visible wavelength of light.
    seen under an optic microscope.

  5. If people are ever able to make mass migrations from the earth to other planets and stars, the separation of people from their homeland earth will be more irrevocable than any we have known on earth, such as the separation of the North American colonists from
  6. Your answer:

  7. The rodent family, which includes mice, rats, squirrels, and rabbits, has many enemies. The rodents' survival stems mainly from the fact that they reproduce in such great numbers that their enemies can support themselves by preying on the surplus numbers only. This in turn protects the rodent from a total loss of its food supply; if the numbers of rodents reproduced were not checked, in a fairly short time they would be exterminated by
  8. Your answer:

  9. The true value of literary works can be established only by the commendation of succeeding generations. Regardless of the success writers may have had or the respect they may have received from their contemporaries, we cannot from these determine the true merit of their work. These may have been a result of novelty in style, a fashionable topic, or ornamentation. Perhaps the next generation will revise the judgment, and what once was admired will be
  10. Your answer:

  11. The thermostat in a house is set at a specific temperature and controls release of heat from the heating mechanism or furnace. The thermostat responds to overheating and to cooling by automatically triggering the heating mechanism off or on. In this way, the thermostat maintains a constant
  12. Your answer:
    fuel consumption.
    release of heat.
    body temperature.
    room temperature.

  13. The installation of industrial air conditioning may result in increased production. Air conditioning makes the greatest difference when the ratio of the amount of building space to the number of workers is low, so priority in obtaining air-conditioning equipment should go to
  14. Your answer:
    departments having the fewest workers per unit area.
    departments having the lowest production rates.
    the most crowded production departments.
    the offices of major executives.

  15. Every year, adult salmon leave the sea and go upstream to the spawning beds where they were born. It is a difficult journey, but some go as far as thirty kilometers a day. After spawning, the adult salmon's life cycle is completed, and it lives only a few days longer. When the young salmon is hatched, they live in the river waters for about a year and then swim to the sea, where the life cycle of the adult salmon
  16. Your answer:
    begins again.
    takes years.
    soon ends.
    is hopeless.

  17. More and more European settlers came to East Africa in the late nineteenth century. The native inhabitants of Africa were affected by this influx of settlers. Though the Europeans came to remove East Africa's wealth of cotton, tea, sisal, and pineapples, they also brought the scientific advances of Europe to the African population. The introduction of medicine allowed the native Africans a longer life, with the result that the African population
  18. Your answer:
    grew richer.
    used the scientific advances.

  19. A principal fruit of friendship is the ease and discharge of the fullness and swellings of the heart, which passions of all kinds do cause and induce. We know diseases of stoppings and suffocation are the most dangerous in the body; it is not much otherwise in the mind. You may take sarsa to open the liver, steel to open the spleen, flower of the sulphur for the lungs, castoreum for the brain, but no receipt opens the heart but
  20. Your answer:
    a surgeon's knife.
    a true friend.
    great sorrow.
    young love.

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