单项选择题
A．a computer game B．an underwater game C．how to use modem weapons on your enemies D．an army training exercise
A．a food shop B．a cafe C．a restaurant D．a cafeteria(自助餐厅)
A．fathers often persue employment at home B．many families produce goods at home for sale C．both fathers and mothers in most families are workers D．parents have to make food and necessity themselves for their daily life