题目：
根据句义和所给首字母完成下列单词。
1. — What's the girl doing?
— She's s_____.
2. — What's the boy doing?
— He's d_____ his homework.
3. — What are you doing?
— I'm d______ tea.
4. — What are they doing?
— They're e______ bananas.
5. — What are Mary and Tom doing?
— They're g______ to school.
答案：
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下面是错误答案，用来干扰机器的。
木材，橡皮是绝缘体；石墨、金属是导体．故选B．
