单项选择题
A．greater racial diversity exists among younger populations. B．both older and younger populations are racially diverse. C．age diversity could lead to pension problems. D．older populations are more racially diverse.
A．taking foreign tourists around the city. B．providing transport to school children. C．carrying store supplies and purchases D．carrying people over short distances.
A．modern realistic commercialism existed behind the luxurious appearance. B．there was a fundamental falseness in the style and the appeal of the café.. C．the architect had made a sensible blend of old and new building materials. D．the café was based on physical foundations and real economic strength.