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Read and fill. 读短文,并填空。 Mary was worried about her weight. “ I'm much too fat. I need to lose a lot of weight . ” Then she visited Dr. Smith. “ It isn't difficult to lose weight, ” he told her, “ Just go on a diet. Eat lots of fruit, vegetables, lean meat and grains. ” A few weeks later, Dr. Smith was surprised to see that Mary was even fatter than before, and she was eating a huge chocolate cake with ice cream. “ I thought you were on a diet. ” He said. “ Yes, I am, ” Mary replied. “ I've already had all the food on my diet today. Now I'm eating my dinner . ”