[单项选择]

According to Crevecoeur, (26) settled in Pennsylvania in the 18th century, the American in those days had the mixed blood of Europeans or their descendants without (27) into consideration other nationalities (28) as American Indians and blacks. Today, the picture of an American is more complex. In American families, there may be sons-in-law or daughters-in-law with European descend ants or Afro-Americans or Asian immigrants although these mixed blood families of whites with other blacks or Asians are (29) the minority. To understand this American, let us go back to American past.
The American continents were peopled (30) a result of two long continuing immigration movements, the first from Asia, and the second from Europe and Africa. The first movement began probably 25,000 years ago when Siberian tribes, in (31) of new hunting grounds or of refuge from pursuing enemies, crossed over the Bering Strait to Alaska. By 149
A. for
B. to
C. in
D. as

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