Beijing is _______ capital of China. And it's one of _______ in Asia.

A．a; the most beautiful city

B．the; the most beautiful city

C．a: the most beautiful cities

D．the; the most beautiful cities

（）是宏观物流产生社会经济效益之根本。

A.配送

B.运输

C.储存

D.包装

E.营销