在太平洋上有个巨大的垃圾场，每平方千米的海上漂浮着上百万片塑料垃圾碎片（下图）。其形成和分布主要受陆地垃圾排放量和洋流系统中洋流涡旋的影响。读下图完成问题。

该垃圾场最有可能分布在图中的

A．①　　　

B．②

C．③ 　　　 　

D．④

A project management technique that is currently in widespread use is the (27) . The purpose of this technique is to detail, in hierarchical fashion, all of the activities that are required to meet project objectives. There are some special activities called (28) , which are events that signify the accomplishment or completion of major deliverables during the project. Most system development methodologies also provide (29) , whose purpose is to contain the various pieces of relevant information - feasibility assessments, schedules, needs analysis, and so forth - in a single place so that they can be presented to project clients and other related parties. Several types of important network diagrams are used in project management. (30) was developed to make clear the interdependence between project tasks before those tasks are scheduled. (31) offers the advantage of dearly showing overlapping tasks.

29（）

A. baseline plan

B. project planning

C. statement of work

D. information system planning