珍惜生命，拒绝酒后驾车．下图是交警检查司机是否酒后开车．接受检测的司机需要把呼出的空气吹进一支管里，如果司机呼出的空气含酒精成分，管中橙红色的部分便会呈现绿色．当绿色过了警戒线时，警察便知道司机酒后驾车了．

信息：重铬酸钾（K₂Cr₂O₇）容易被还原．酒精（C₂H₅OH）被重铬酸钾氧化为乙醛（CH₃CHO）和乙酸（CH₃COOH），而橙红色的重铬酸钾便会变成绿色的铬离子（Cr³⁺）．

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?