阅读理解。 It is a fine Sunday morning. There are a lot of children near the river. They are students of Grade One of No. 15 Middle School. There are two teachers with them. All of the students are Young Pioneers. They are having their Young Pioneers' Day.What are they doing? They are planting trees (树) and flowers (花). Some of the boys are carrying (背) new trees; some are planting them. Some of the girls are carrying water; some are watering (浇水) new trees. The teachers are helping them. 1. Who's near the river? A. Many students. B. Two teachers. C. Many students and two teachers. D. Many boys. 2. Are the students in the same class? A. Yes, they are. B. No, they aren't. C. We don't know. D. No, they are. 3. What are they doing? A. They are working. B. They are playing. C. They are having lessons. D. They are planting trees. 4. The new word 'plant' means _ ____ . A. 砍伐 B. 保护 C. 种植园 D. 植物 5. What are the teacher doing? A. They are helping the new trees. B. They are helping their students plant trees. C. They are helping their students do homework. D. They are watching.