单项选择题A．Because people have more free time to spend than before.B．Became people meet more problems than their parents.C．Because people have more choices from How to books than any other books.D．Because modern life is more difficult to deal with.

单项选择题A．All the Americans families have ears.B．Car pools put fewer cars on the road.C．Parking places are always available in large cities.D．Cars are driven only by businessmen.