题目

验钞机能检验人民币的真伪，它的原理是利用了 使荧光物质发光，彩色电视机屏幕工作时主要由红、绿、 三种色光混合成绚丽多彩画面，它的摇控器是利用 来工作的． 答案：【1】紫外线【2】蓝【3】红外线 In Disneyland, every year, some 800,000 plants are replaced because Disney refused to ________ signs asking his “guests” not to step on them． [　　] A．send up B．set up C．put up D．take up