[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]The（）process analyzes the effect of risk events and assigns a numerical rating to those risks.

正确答案 ：B

Quantitative RiskAnalysis

解析：该题的关键词为"analyzes the effect of risk, numerical rating"，其语句结构为"The（）一process（主语）analyzes（谓语）the effect of risk events（宾语）and assigns（并列谓语）anumerical rating to those risks（并列宾语）"，含义为"什么过程分析风险事件的后果，并且为这些风险指定数值级别"，容易判断题目描述的是量化风险分析的特点，应该选择选项B。

[单选题]During the project, requirements change for a variety of reasons. As needs change and as work proceeds, additional requirements are derived and changes may have to be made to the existing requirements. It is essential to manage these additions and changes efficiently and effectively. To effectively analyze the impact of the changes, it is necessary that the source of each requirement is known and the rationale for any change is documented. The project manager may, however, want to track appropriate measures of requirements volatility to judge whether new or revised（）are necessary.

正确答案 ：B

controls

解析：该题的关键词为"appropriate measures、 requirements volatility"，其语句结构为"The project manager（主{吾） may, however, want to track（谓{吾） appropriate measures of requirements volatility（宾语） to judge whether new or revised（）are necessary（目的状语从句）"，含义为"项目经理也许会跟踪需求变化的相关度量，以判断是否应该调整的或者新的什么"，因为整段文字讨论的内容都集中于需求变更管理，所以只分析最后一句即可，根据题意，应该在空白处填写"措施"一类的词汇，排除之后只有选项B比较适合，选项A、C和D都可以排除，尤其是选项D是一个很生僻的词汇，含义为"尝试"。

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