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SPECIAL EVENTS THIS WEEKEND          Captain Good Fellow  Do your children enjoy interesting stories, funny games, and exciting dances? Captain Good Fellow will be ready to teach all these things to children of all ages at the City Theatre on Saturday morning at 10:00, Free.                      Walking Tour of the Town  Forget your worries on Saturday morning. Take a beautiful walk and learn about local history. Meet at the front entrance of City Hall at 9:30. Wear comfortable shoes!                      Films at the Museum  Two European film下列代数式中，单项式共有（　　）①2πr2；②-xy25；③1a+a；④x+y2．A．1个B．2个C．3个D．4个