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本节教材加了这样一段眉批：“科学概念的力量在于它具有解释和概括一大类自然现象的能力。在这方面能量概念的作用十分独特。”对此，你是如何理解的？

答案

提示：从能量“具有解释和概括一大类自然现象的能力”这一角度加以理解。

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根据句义及首字母提示完成单词。

1. These are d               animals. Don't be close to them.

2. Tom b              my dictionary and didn't return it.

3. His mother is cooking in the k             .

4. We are all here e              John, because he's ill in bed at home.

5. Please speak l             . I can't hear you clearly.

6. A UFO l              on Center Street last Sunday.

7. Don't be n             . There's nothing wrong with you.

8. Tom, you should put on your clothes by yourself. You aren't a child a            .

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填空题

生石灰的主要成分是（）
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