1. the empirical evidence suggests that ( ) extra working hours can have positive effects on labor market outcomes, while others reporting zero or negative effects.

　　a. absorbing

　　b. adopting

　　c. abolishing

　　d. abandoning

　　【答案】d。经验证据表明，减少额外的工作时间对劳动力市场的结果有积极的影响，而其他报告为零或消极的影响。a选项意为“吸引”;b选项意为“采取”;c选项意为“废除(法律、条款等)”;d选项意为“放弃”。故正确选项为d。

　　2. the internet is extensively utilized by students for ( ) information to undertake their course-related tasks and assignments.

　　a. maintaining

　　b. evaluating

　　c. retaining

　　d. retrieving

　　【答案】d。学生广泛利用互联网检索信息，进行与课程相关的任务和作业。retrieve information from the database从数据库检索资料。a选项意为“维护、保养”;b选项意为“评估”;c选项意为“留住的”;d选项意为“检索方法”。故正确选项为d。

　　3. the search was based on the same combination of concepts and search terms and ( ) another 176 publications.

　　a. yielded

　　b. offered

　　c. provided

　　d. supplied

　　【答案】a。由题意可知，空缺处缺少动词。a选项意为“屈服;出产;放弃”;b选项意为“提供;出价;试图”;c选项意为“提供;规定;准备;装备”;d选项意为“供给，提供;补充”故正确选项是a。