I don't think that good books are difficult to find ______ how to live a low-carbon life.

[      ]

A. for

B. to

C. on

D. in

以下不具有“完成一开始”关系的两个活动是（）

A.系统设计，设计评审

B.系统分析，需求评审

C.需求评审，周例会

D.确定项目范围，制定WBS