鼠标器、打印机和扫描仪等设备都有一个重要的性能指标，即分辨率，它用每英寸的像素数目来描述，通常用三个英文字母 【19】 来表示。
参考答案：DPI(或dpi)
补全对话。
T-Tina M-Mary
M: 1 did you go on your trip?
T: I 2 to the mountains. How about you?
M: I visited the aquarium. What did you do there?
T: I went hiking and had a picnic.
M: That 3 fun.
T: What did you see there？
M: I 4 some sharks, seals and a big octopus. Then we watched a dolphin show.
T: What else did you do?
M: We watched a movie about sharks. It was interesting.
T: Oh, did you take any 5 ？
M: Yes, I'll show you some.
T: Great!
1.______2.______3.______4.______5.______
（3分）甲、乙、丙、丁四种物质，在一定条件下有如下转化关系，图中反应条件已略去。已知甲、乙都为黑色固体，丁为红色金属，回答下列问题：
（1）乙物质的名称为 。
（2）写出图中实现转化的方程式
① ，②
