单项选择题
A．They are too busy. B．They work in distant cities. C．They can’t afford expensive visits to their parents. D．Their relations are not very tight.
A．over the water B．beside the water C．under the water D．on the water
A．They became cheaper and easier to use. B．They became larger and larger. C．People couldn’t buy them anywhere. D．People could get information only from them.