第9题: [单项选择]The process of (17) schedule activity durations uses information on schedule activity scope of work, required resource types’ estimated resource quantities, and resource calendars with resource availabilities. A. estimating B. defining C. planning D. sequencing 参考答案:A 答案解析:[分析] 估算进度活动历时的过程会用到进度活动工作范围、所需资源类型、估计的资源数量，以及建立在资源可用性上的资源日历等信息。
第11题: [单项选择]薄层色谱法用于药物鉴别，具有特异性强，但常须采用对照品是因为： A. 一些药物的Rf值数据不足 B. 硅胶G等试剂的性质欠稳定 C. 为了消除实验因素的影响，使结果稳定 D. 质量标准的例行要求 E. 观察方法的需要 参考答案:C
第12题: [单项选择]Mary's professor had her ______ paper many times before allowing her to present it to the committee. A. rewritten B. to rewrite C. rewrite D. rewriting 参考答案:C 答案解析:have sb．do sth．表示“让某人做某事”。have在句中是使役动词，其后不定式省 to。
第20题: [单项选择]We gave out a cheer when the red roof of the cottage {{U}}came into view{{/U}}. A. began to be seen B. began to see C. go to someplace D. looked at 参考答案:A 答案解析:come into view为固定词组，意为“看得见”，相当于begin to be seen。
