The passage is mainly about ________.

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• 1The hot spot theory may prove useful in explaining ________.

  A.the structure of the African plates

  B.the revival of dead volcanoes

  C.the mobility of the continents

  D.the formation of new oceans

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• 2That Africa and South America were once joined can be deduced from the fact that ________.

  A.the two continents are still moving in opposite directions

  B.they have been found to share certain geological features

  C.the African plate has been stable for 30 million years

  D.over 100 hot spots are scattered all around the globe

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• 3The author believes that ________.

  A.the motion of the plates corresponds to that of the earth’s interior

  B.the geological theory about drifting plates has been proved to be true

  C.the hot spots and the plates move slowly in opposite directions

  D.the movement of hot spots proves the continents are moving apart

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• 4The word “demographers” (Line 1, Paragraph 8) most probably means ________.

  A.people in favor of the trend of democracy

  B.advocates of migration between states

  C.scientists engaged in the study of population

  D.conservatives clinging to old patterns of life

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• 5We can see from the available statistics that ________.

  A.California was once the most thinly populated area in the whole US

  B.the top 10 states in growth rate of population were all located in the West

  C.cities with better climates benefited unanimously from migration

  D.Arizona ranked second of all states in its growth rate of population

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