材料一：东西各国之强，皆以立宪法、开国会之故。国会者，君与民共议一国之政法也。……人主尊为神圣，不受责任，而政府代之。东西各国皆行此政体，故人君与千百万之国民合为一体，国安得不强？

——康有为《请定立宪开国会折》

材料二：西太后与荣禄已早定密谋，于前一日下诏……（命）二品以上大臣，咸具折诣后前谢恩。政变之事，亦伏是矣。

——梁启超《戊戌政变记》

材料三：1868年，明治政府以天皇名义颁布了《五条誓文》：一，广兴会议，万机决于公论；二，上下一心，大展经纶；三，官武一体，以至庶民，各遂其志，务使人心不倦；四，破旧来之陋习，基于天地之公道；五，求知识于世界，大力振兴皇基。

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根据短文内容，回答下列问题。
   Linda and Mary are good friends. Linda is thirteen. She comes from the U.S.A. Mary is twelve. She's from London(伦敦). They study in the same school, but in different classes. Linda's father teaches English in a middle school. Her mother drives a car. Mary's mother works in an office. Her father is a doctor. Linda can speak English, French(法语) and a little Chinese. Linda's mother likes cooking. She likes eating rice. But Linda' s father doesn't. He likes drinking milk and eating bread. Mary's mother doesn't like cooking. But she likes doing some shopping. She can make nice skirts and dresses. Mary's father likes doing housework(家务).

下列结构中不属于器官的是（　　）