单项选择题
A．when we are hungry B．when we want to C．after the meal D．before the meal
A．wasn’t feeling very well B．hated to drive in the dark C．wanted to take some exercise D．didn’t want to be caught by the police
A．people can live from 120 to 180 B．it is still doubtful how long humans can live C．the human body is designed to last past about 120 years D．it is possible for humans to live longer in the future