如图，使装水的试管B浸在烧杯A的水中，下面用酒精灯加热，则烧杯A中的水先沸腾后，以试管B中的水（　　）

A: Good afternoon, Jim.

B: Good afternoon, Alex.  ____?

A: My birthday is on May 3rd.____?

B: My birthday is on November 27th.

A: Oh, today is your birthday, right?

B: Oh! I forgot(忘记) it.

A: ____You can call our friends -- Jenny, Mike and Bob. And we can have dinner at your home.

B: That's great. But I forgot Jenny's telephone number.____?

A: It is 365-4052.

B: ____?

A: I think pizza (披萨) is great, and we can go to the store to buy a birthday cake and some fruit.

①为探究催化剂的种类对氯酸钾分解速度的影响，甲设计以下对比实验：

A．将3.0g KClO₃与1.0g MnO₂均匀混合加热

B．将x g KClO₃与1.0g CuO均匀混合加热

在相同温度下，比较两组实验产生O₂的快慢．B中x值应取____

A中反应的化学方程式是____

②乙探究了影响双氧水分解速度的某种因素．实验数据记录如下

本实验中，测量O₂体积的装置是图1中的____（填编号）．

实验结论：在相同条件下，____双氧水分解得越快．

丙用图2装置进行实验，通过比较____也能达到实验目的．