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

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• 1The 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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• 2The 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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• 3We 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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• 4The census distinguished itself from previous studies on population movement in that ________.

  A.it stresses the climatic influence on population distribution

  B.it highlights the contribution of continuous waves of immigrants

  C.it reveals the Americans’ new pursuit of spacious living

  D.it elaborates the delayed effects of yesterday’s “baby boom”

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• 5Discerned from the perplexing picture of population growth the 1980 census provided, America in 1970s ________.

  A.enjoyed the lowest net growth of population in history

  B.witnessed a southwestern shift of population

  C.underwent an unparalleled period of population growth

  D.brought to a standstill its pattern of migration since World War II

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• 6The 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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• 7The passage is mainly about ________.

  A.the features of volcanic activities

  B.the importance of the theory about drifting plates

  C.the significance of hot spots in geophysical studies

  D.the process of the formation of volcanoes

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