单项选择题
A．problems B．questions C．words D．phrases
A．there is more food and water in space than on earth B．eating and drinking in space is a special problem C．astronauts can never eat or drink in a spaceship D．there is no food or water in a spaceship
A．The water would come from the open cups. B．The water would spill all over their food. C．Crumbs would float in the cups. D．The cups would float in the air.