_______ isn't afraid of swimming in the sea. ( )
近年来雾霾频现,大气质量堪优.下列做法不利于保护大气环境的是( )
照样子写词语
①懒洋洋:____ ____ ____
②碧绿碧绿:____ ____ ____
如图,将一副直角三角板叠在一起,使直角顶点重合于点O,则∠AOB+∠DOC=____ 度.