①写出上述标号仪器的名称：a.____b.____c.____d.____

②甲同学用双氧水制取氧气，发生反应的文字表达是____，选择的收集装置是D或____，用D收集氧气时验满的方法是（写出操作步骤、现象、结论）____．乙同学用氯酸钾和二氧化锰为原料制取氧气，二氧化锰的作用是____，应选择的发生装置是____．该同学发现产生的气体能使带火星的木条复燃并有刺激性气味，下列分析不合理的是____．

a .反应中氧气的物理性质发生了变化

b. 此时得到的气体一定是混合物

c .只加热氯酸钾，若生成的气体无气味，说明刺激性气味一定与二氧化锰有关

d .可能是生成的氧气与残留在发生装置中的空气在加热的条件下反应生成了新物质．

水泥和陶瓷工业的共同原料是下列物质中的                                    (　　)

完成对话
A: How was your vacation, Fred?
B: ____ .
A: ____ ?
B: I went to the U.S. with my parents.
A: Cool! ____  in the U.S.?
B: First we went to Los Angeles(洛杉矶). My uncle lives there. Then we went to New York to see my cousin.
A: ____ ?
B: It was a little warm but sunny.
A: Did you see any movie stars in Los Angeles?
B: No, but I saw Tom Cruise in New York. He was at a restaurant! I got his autograph.
A: Wow! That’s great!  What else did you do in New York?
B: Hmm…Oh yeah, I also went to Central Park.____ there! .