[单选题]The（）defines the phases that connect the beginning of a project to its end.

正确答案 ：B

project life cycle

解析：该题的关键词为"phases"，其语句结构为"______（主语）defines（谓语）the phases"，含义为"什么定义了项目的多个阶段"，通过筛选首先排除A和C，选项D也容易排除，因为Milestone（里程碑）只是关键点上发生的活动，不具备阶段的持续性特点，因而只能选择选项B。

[单选题]Estimating schedule activity costs involves developing an (1) of the cost of theresources needed to complete each schedule activity. Cost estimating includes identifying and considering various costing alternatives. for example, in most application areas, additionalwork during a design phase is widely held to have the potential for reducing the cost of the execution phase and product operations. the cost estimating process considers whether the expected savings can offset the cost of the additional design work. cost estimates are generally expressed in units of (2) to facilitate comparisons both within and across projects.the (3) describes important information about project requirement that is considered during cost estimating.

正确答案 ：

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