China _____ over 300 Confucius Institutes in more than 90 countries and areas to teach Chinese

and promote Chinese culture in the past five years.[ ]

A. is establishing

B. established

C. has established

D. had established

按建标[2003]206号文的规定，在建安工程造价中，安全施工费=（）×安全施工费费率。

A．人工费

B．直接工程费

C．材料费

D．直接费