我国许多地区遭遇了严重的雾霾天气，其中“雾”的形成是水蒸气____形成的，而造成“霾”的主要元凶之一就是PM2.5等可吸入颗粒物，它们与雾气结合在一起，让天空瞬间变得阴沉灰暗．大气中PM2.5指直径小于或等于2.5微米的颗粒物，2.5微米合____米，它还将通过呼吸道进入人体血液，危害人体的健康．

﹣6的绝对值是（　　）

阅读短文，根据短文内容，选择正确答案。

Bob: Hello, Candy! What are you going to do on Sunday?

Candy: Oh, I'm going to the park to have a picnic.        

Bob: Do you like having a picnic?

Candy: Yes, I do. What about you?

Bob: Me, too. But my favourite hobby is playing computer games.

I think it's very fun.

Candy: D o you want to go with us?

Bob: Sure. What time?

Candy: At 8:00 o'clock tomorrow.

Bob: OK. See you later.

Candy: See you.