题1：China’s new food law provides for a food recall (召回) system ______ producers have to stop production if their food isn’t up to standards. A. when B. on which C. where D. which 答案：C 详解：______ producers have to stop production if their food isn’t up to standards是定语从句，其先行词为system。从句中缺少地点状语，所以选where。这里where=in which。
题2：When you come to China you can’t help noticing a “can-do” attitude and a general sense that this is a society ______is looking ahead. A. whereB. asC. whoD. that 答案：D 详解：_____is looking ahead是定语从句，其先行词为society。从句中缺主语，所以选that。
题3：Young people who have got jobs may realize university lessons can’t be the only preparation for all of the situations ______ appear in the working world. A. whereB. whenC. that D. what 答案：C 详解：______ appear in the working world是定语从句，其先行词为situations。从句中缺主语 ，所以选that。
题4：Early in the 1990s no one had any idea that J.K. Rowling had come up with the story of Harry Potter, ______ later became a best seller. A. whatB. who C. whomD. which 答案：D 详解：______ later became a best seller是定语从句，其先行词为Harry Potter，从句中缺主语，所以选which。
题5：Since 1995, ______ people call the Year of the Internet, the world has turned flat thanks to the network. A. whenB. whichC. in whichD. that 答案：B 详解：______ people call the Year of the Internet是非限制性定语从句，排除D；先行词1995在从句中作主语，所以选which。
