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It was December 25. Marie, a 13-year-old Australian girl, was happy. It was Christmas and Marie’s mother was making a very special cake. She put four small coins into the cake and then baked it. The four coins were for good luck. After dinner, Marie and her family ate the cake. They found three coins in the cake and put them on the table. Where was the fourth one It was missing(找不到的), but Marie’s mother didn’t notice.
After Christmas, Marie got sick. She coughed and couldn’t speak. Marie’s parents took her to hospital. Doctors at the hospital looked her over and then said," We are sorry, but we can’t help her. "For 12 years, Marie didn’t speak. But like other common people, she grew up, she got a job, she got married. One day, when Marie was 25 years old, she got a sore throat. She began to cough. She coughed up something small and black. What was it Marie didn’t know. She took it to a hospital. A doctor at the hospital said," This is a coin!" The doctor told Marie," I think you can speak again. \
What can you infer(推出)from the passage ( )