第一节 完形填空 (共10小题；每小题2分，满分20分)
阅读下面短文，掌握其大意，然后从21—30各题所给的A、B、C和D项中，选出最佳选项
Free to fly with the wind
One windy spring day, I observed young people having fun by flying their kites in the wind. Colorful creations of varying shapes and sizes filled the blue and clean skies like beautiful birds dancing. As the strong winds blew against the kites, a 16 kept them in control.
