单选题
根据下面短文回答下列问题。 Mrs. Green was
worried about her weight (体重). "I'm too fat (肥胖的). I need to lose (失去) my
weight, but I don't know how to do it." she told her friend.
"Go and see Dr. Wang," her friend said. "He'll tell you how to lose weight."
Mrs. Green visited Dr. Wang and told him her problem. "It isn't
difficult to lose weight," he told her. "All you need to do is go on a diet
(吃规定的饮食). I'll give you one." He began to write on a piece of paper.
"Eat lots of fruit and vegetables (蔬菜). Also eat a lot of lean (瘦的) meat
and grains (谷物)." When he finished, he handed her the piece of paper. "There you
are," he said. "Eat all those things and you'll soon lose weight."
A few weeks later, Mrs. Green's friend called on her. She was surprised
to see that she was even fatter than before and that she was eating a big
sandwich with chocolate cake and ice cream. "I thought you were
on a diet," her friend said. "Oh, I am," Mrs. Green said. "I've
already had all the food on my diet today. Now I'm eating my dinner."