近来，由于成本上升，更因为游资爆炒，出现了大蒜、绿豆、生姜等一些商品价格暴涨的现象，于是生活中出现了一些新名词：“蒜你狠”、“豆你玩”、“玉米疯”、“糖高宗”、“姜你军”、“煤超疯”等。这体现了什么哲学道理（）

①物质和意识不可分

②物质决定意识，意识是对物质的反映

③世界的本原是物质

④物质第一性，意识第二性

A.①②③④

B.①②④

C.②④

D.②

Diana bought a stereo for $530, which was the retail price plus a 6 percent sales tax. How much money could she have saved if she had bought the stereo at the same retail price in a neighboring state where she would have paid a sales tax of 5 percent ？（）

A．$1.00

B．$2.65

C．$4.30

D．$5.00

E．$5.30