This week Michael Bloomberg, ________Mr Giuliani soon after those terrorist attacks, put forward

a 25year plan for upgrading the city. [ ]

A. who succeeded    

B. he succeeded

C. succeeded    

D. which succeeded

生态系统根据人类干预程度划分为（）

A.自然生态系统

B.人工生态系统

C.半自然生态系统

D.经济生态系统