【单选题】Going on a Diet Atypical person needs about l,800 calories per day to stay alive. These calorieskeep your heart (51) and your lungs breathing. They keep yourorgans operating _ (52) and,yourbrain runni...
【单选题】根据材料回答下列各题: Going on a Diet A typical person needs about l,800 calories per day to stay alive.These calories keep your heart___________ (51)and your lungs breathing.They keep your organs operating____...