题目

Good morning, ladies and gentlemen．I’m very pleased   1   （see） all of you here because you are my special guests．Welcome to our company’s museum．My name is Brown, George Brown．I’m the general manager of the company．As you all know, we   2   （main） make computers in our company, as well as some other electronic products．But we are also quite interested in   3   （educate）．That’s why we have founded this museum,  4   children can learn how computers have been developed, how they are made   5   how they are used in industry, agriculture, scient（2007?韶关）只用一种试剂就能将NaCl、H2SO4、Ca（OH）2三种溶液鉴别出来的试剂是（ ）A．紫色石蕊试液B．酚酞试液C．氯化钡溶液D．盐酸