单项选择题
A．Environmental pollution and protection. B．Taxes and services for the public. C．Police efforts to protect people. D．People’s attitude toward taxes.
A．Spending more time on sightseeing. B．Visiting the city with a group. C．Touring the city on a fine day. D．Taking the man with her on the tour.
A．They led to the discovery of America. B．They made native American foods popular. C．They brought great wealth to Spain. D．They made native American life styles well-known.