The traffic rule says young children under the age of four and________ less than 40 pounds must be in a child safety seat

A．being weighed

B．weighs

C．weighed

D．weighing

中国建筑师以自强的民族性格设计出一批富有民族传统优秀建筑和室内设计作品，如（）设计的（）和（）、（）等建筑。