| 听下面一段材料，回答第1至4题。 |
| 1. What kind of passage have you just heard? |
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| A. A public lecture. B. A radio announcement. C. A government statement. |
| 2. What is the main purpose of the event? |
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| A. To increase people's sense of environment protection. B. To invite people to join an environmental organization. C. To persuade families to have an outing in the mountains. |
| 3. How many trees are going to be planted today? |
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| A. 7,000 B. 2,000 C. 4,000 |
| 4. What does the speaker advise volunteers to do? |
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| A. To learn some tree-planting skills. B. To come along any time they like. C. To bring along their gloves. |