It is        the customers’ needs that has made chain stores so popular in big cities in China.

A．meeting

B．met

C．to have met

D．being met

尿从形成到排出体外，经过的器官依次是 [ ]

A．肾脏、输尿管、膀胱、 * *        

B．肾脏、膀胱、 * * 、输尿管

C．肾脏、膀胱、输尿管、 * *        

D．膀胱、肾脏、输尿管、 * *