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阅读下面短文，掌握其大意，然后从21-30各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。
Mary Kimble-Smith was an ordinary 12-year-old girl; ordinary, that is, in every way 21 one. She suddenly started to walk in her sleep. No one knew why this happened. The best guess seems to be that it represents 22
Mary Kimble-Smith was an ordinary 12-year-old girl; ordinary, that is, in every way 21 one. She suddenly started to walk in her sleep. No one knew why this happened. The best guess seems to be that it represents 22
