题目

阅读理解 There is a student from China in our class. He is very good at his lessons, but he is also very shy. He doesn’t talk too much with us because he thinks that there are so many differences. When he came into our classroom for the first time, he was so frightened (受惊的) that he cried out. That’s because of our appearances. For example, his hair is short, black and straight, but ours are all different from his. Jim’s hair is yellow and much longer than his. Dave’s hair is curly and brown. Kitty’s hair is blonde. Our builds and clothes seem to be strange in his e只用一种试剂经过一步操作便可鉴别HCl、NaOH和NaCl三种溶液，这种试剂是（ ）A．碳酸钠溶液B．稀硫酸C．石蕊试液D．石灰水