Nowhere do 1980 census statistics dramatize more the American search for spacious living than in the Far West. There, California added 3.7 million to its population in the 1970s, more than any other state.

　　In that decade, however, large numbers also migrated from California, mostly to other parts of the West. Often they chose - and still are choosing - somewhat colder climates such as Oregon, Idaho and Alaska in order to escape smog, crime and other plagues of urbanization in the Golden State.

　　As a result, California’s growth rate dropped during the 1970s, to 18.5 percent - little more than two thirds the 1960s’ growth figure and considerably below that of other Western states.

　　13. Discerned 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

　　14. The 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

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