"______" is the translation equivalent of "social sciences".
参考答案：社会科学
—Oh, Mrs. King, your necklace looks nice. Is it new?
—No, I _____ it for two years. [ ]
A. had
B. have had
C. bought
D. have bought
下图数据为2012年3月25日宁波市环保局所提供，据市环境监测中心专家预计，今年清明期间我市天气晴好，PM2．5浓度值有可能继续上升。PM2．5浓度值代表的是每立方米空气中可吸入颗粒物的含量。结合图与材料回答下题。
________________________________________________________________________________
