閱讀理解
David always had headaches and stomachaches．First, David’s doctor gave him some medicine, but it didn’t work．Then his doctor asked him about his favorite food．David said he ate a lot of fish．His doctor said, “Stop eating fish．”When David stopped eating fish, he felt much better．
Mary often had a very sore throat after eating．First，she stopped drinking milk and eating cheese，but this made no difference．Then, in the summer, the problem became worse, and it was difficult for Mary to eat．Her doctor asked about her diet．She said she ate about ten tomatoes a day．The doctor asked her not to eat tomatoes．When she stopped eating tomatoes, her throat got better．
Fred worked in a car factory．There was something wrong with his hands and he could not hold his tools(工具)．First, he went to his doctor，and she asked him to have a good rest．It didn’t work．After that, his doctor asked him about his diet．Fred said he ate a lot of bread．She told him not to eat bread．Ten days later, Fred could hold his tools again．
