[单选题]The（）technique involves using project characteristics in a mathematical model to predict total project cost. Models can be simple or complex.

正确答案 ：A

costaggregation

解析：可以注意到该题的关键词为"mathematical model"和"predict total project cost"，再划分语句结构"The（）technique(主语)involves(谓语)using project characteristics in a mathematical model to predict total project cost"，易理解语句含义为"什么技术使用数学模型预测项目的总成本"。观察四个选项，ABD也可能应用数学模型，也可能只是简单的数字规定，但选项C 一定会应用数学模型，所以应该选择parametric estimating。

[单选题]（） are individuals and organizations that are actively involved in the project, or whose interests may be affected as a result of project execution or project completion; they may also exert influence over the project and its results.

正确答案 ：C

projectstakeholders

解析：该题的关键词为"individuals and organizations、 be affected、 exertinfluence"，其语句结构为" （主语）are（谓语）individuals and organizations"，含义为"什么是个人或组织"，选项A和B容易排除，选项D虽然也受项目影响，也可以施加影响，但其不表示为组织形式，因而 也可以排除。实际上，这句话正是project stakeholders（项目干系人）的定义，所以选择C。

[单选题]Fair and(1) competition in government procurement around the world is good business and good public policy. Competitive pricing, product(2)and performanceimprovements result from competitive practices and help ensure that government authoritiesget the best (3)for the public they serve.

正确答案 ：

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