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.

化学电池在通讯、交通及日常生活中有着广泛的应用。

（1）目前常用的镍(Ni)镉(Cd)电池，其电池总反应式可以表示为：

已知Ni(OH)₂和Cd(OH)₂均难溶于水，但能溶于酸，以下说法正确的是____。

①以上反应是可逆反应

②以上反应不是可逆反应

③充电时化学能转变为电能

④放电时化学能转变为电能

A．①③

B．②④

C．①④

D．②③

（2）废弃的镍镉电池已成为主要的环境污染物，有资料表明一节废镍镉电池可以使一平方米面积的耕地失去使用价值。在酸性土壤中这种污染尤为严重。这是因为______________________________________。