单项选择题
A．While B．Moreover C．However D．Therefore
A．indifferent to this case B．very worried about this case C．quite concerned about this case D．quite optimistic about this case
A．hunger is less painful once you get used to it B．a man can survive for years on only one meal a day C．you enjoy your food more if you go hungry for a while D．something should be done for the hungry people of the world