为探究催化剂的种类对氯酸钾分解速度的影响，设计了以下对比实验：

a．将12.25g KClO₃与5.0g MnO₂均匀混合加热

b．将12.25g KClO₃与5.0g CuO均匀混合加热

陕西榆林地区“乌金（煤）遍地”，资源非常丰富。5年前开始，该地“村村点火，处处冒烟”，被人们戏称为“黑三角”。据此回答下列各题。

A Party

Donny: Kim and I want to throw a goodbye party for Chuck.

It's this Saturday night at Kim's house.

Tina: That's a good idea. What do we need to do?

Kim: We need to buy some food and drinks. Tina, please meet me at 10 o'clock on Saturday morning. We'll go shopping.

Tina: OK!

Donny: Pam, you have a lot of great CDs. Please bring your CDs.

Pam: Sure! I will take care of the music.

Tina: Did you invite Chuck's other friends?

Donny: Yes. We already invited them and gave them Kim's address. It will be fun.

Tina: Wow! I can't wait for the party.

Chuck: Hey! What party?