题目

Taobao.com is a free site, _________ visitors can not just purchase almost all kinds of products but open their own online shops. A. where    B. which   C. what D. whose 答案：A 解析: 考查定语从句的引导词，这是用where引导限制性定语从句。14．已知点A（1，4），B（4，1），直线L：y=ax+2与线段AB相交于P，则a的范围[$-\frac{1}{4}$，2]．