阅读对话，判断句子正(T)误(F)。

T: Good morning, class.

Ss: Good morning, teacher.

T: Is everyone here?

S1: Mike isn't here. He is ill.

T: I'm sorry to hear that. What's wrong with Mike?

S1: His arms hurt. The doctor said he must stay in bed for a few days.

T: Oh. Let's go and see him after school.

Ss: Great!

( ) 1. Everyone is here.

( ) 2. Amy is ill.

( ) 3. Mike must stay in bed for a few days.

( ) 4. Mike's legs hurt.

( ) 5. The teacher and the students will go and see Mike after school.

( ) 6. Mike isn't at school.

懂得一些燃烧与爆炸的基本常识可以避免一些危险事故的发生。下列图标与燃烧和爆炸无关的是