Reading for Understanding Three #47C

Thelma Thurstone The McGraw-Hill Companies, Inc.

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  1. Light travels at a rate of 299, 792 kilometers per second. Moving for a year at this rate, a light ray would cover a distance of about 9461 x 10 to the 12th power kilometers. This distance is called a light-year. To say that a star is five light-years away from the earth means that
  2. Your answer:
    a spaceship would take five years to reach that star.
    the earth and the star are about 9461 x 10 to the 12th power kilometers apart.
    the star is five times 299,792 kilometers from the earth.
    light form that star takes five years to reach the earth.

  3. At one time such diseases as leprosy, smallpox, tuberculosis, and measles were essentially unknown among the islanders of the South Pacific. The climate, food, and general living conditions of the people did not breed such diseases. As long as the islands remained isolated, the disease-free conditions remained. But this condition began to change rapidly when
  4. Your answer:
    strangers arrived.
    the climate changed.
    war broke out.
    people died.

  5. We carefully should consider the source of our information. We should seek out both sides of a question and form the habit of having suspended judgment and an open mind receptive to
  6. Your answer:
    radio reports.
    new evidence.
    no influence.

  7. The lowest point at which combustible substances will ignite and burn is called kindling temperature. The kindling temperature is not the same for all materials. Matches, paper, wood shavings, and gasoline ignite almost instantly, but coal and oil ignite more slowly. The kindling temperature of the former substances is
  8. Your answer:

  9. The tourist industry is second only to the manufacture of automobiles in the business activity of the state of Michigan. Millions of people visit the state as tourists each year. There are many lakes and rivers where the fishing is excellent. There are many places for boating and other water sports. The climate in the northern part of the state is good for vacations. Another reason why so many people spend their vacations in Michigan is that it is not too far from many
  10. Your answer:
    large cities.

  11. A large percentage of all jobs in manufacturing plants are dependent on steel. A strike among workers in steel plants directly or indirectly causes widespread
  12. Your answer:

  13. The forces of the elements rearrange the earth's features. A new volcano, however, does not burst out of a wheat field nor does an island disappear beneath the ocean every day. Most changes are hardly noticeable in one lifetime. The changes that take place on the surface of the earth are not, for the most part,
  14. Your answer:

  15. Scientists have refined a device for testing the ripeness of apples without damaging the fruit. The original instrument cut the skin of the fruit and thereby destroyed it. The improved device operates like a mechanical thumb. It tests and records the degree of ripeness of the fruit by
  16. Your answer:
    cutting it.
    feeling it.
    tasting it.
    x-raying it.

  17. The westward surge across the United States was an economic development, chaotic and unorganized, unchecked by any responsible agent with a long-term vision of future centuries. For many years, this surge was one of reckless, unlimited exploitation of the natural resources of this continent. Now, because of this recklessness, people are being forced to conserve and to use carefully their natural resources. We have learned that these resources are not
  18. Your answer:

  19. Sometimes it is difficult for a zoo to acquire a very rare animal because the animal's native country protects it against capture. At other times, zoos have been able to help prevent the extinction of animals through good care given to animals in captivity. These captive animals often produce young that have a better chance to survive than
  20. Your answer:
    their owners can believe.
    domestic animals in the zoos.
    in their natural surroundings.
    if they had been caught.

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