[单项选择]The North American frontier changed some of the characteristics of the pioneers of the 1750’ s and intensified others. They were, as a group, semiliterate, proud, and stubborn, as dogged in their insistence on their own way of life as pine roots cracking granite ( 花岗岩) to grow. Perhaps their greatest resource was their capacity to endure. They outlasted recurrent ( 周期性发生的) plagues of smallpox (天花) and malaria (痢疾) and a steady progression of natural accidents. They were incredibly prolific. Squire Boone’ s family of eight children was small by frontier standards. James Roberston, an eventful neighbor of Boone’ s and the frontier of Nashville, had eleven children. Twice-married, John Sevier, the first governor of Tennessee, fathered eighteen; his long time enemy, John Tipton, also twice married, produced seventeen.
The entire assets of one of these huge families often amounted, in the beginning, to little more than an axe, a hunting knife, an auger, a rifle, a horse or two, so
A. Corn, cattle, arid pigs.
B. Fresh food and native vegetables.
C. Indian maize, native fruits, and wild meat.
D. Preserved fruits, dried meats, and pine roots.

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