单项选择题
A．California redwoods were named in his honor. B．He was illiterate. C．He created a unique alphabet. D．He recovered from his madness and helped mankin
A．Many people who went West were doctors. B．Medicine and the people who sold it were not reliable. C．Many pioneer women died from bites inflicted by snakes and mosquitoes. D．Pioneer women had to invent their own remedies when they moved West.
A．our natural surroundings are in danger of being destroyed by industry B．the fixed supply of natural resources marks a point beyond which economic growth cannot continue C．the world population is ever increasing D．more efforts should be made to improve the quality of our material life