在生态系统中，非生物成分包括 、 、 和 等，生物成分包 括 、 和 。
阳光 空气 水 土壤 植物 动物 微生物
句型转换。
1. My father stayed there for two months. (对划线部分提问)
________ ________ did your father ______ there?
2. He went to school at the age of seven. (改为同义句)
He went to school ________ he ________ seven years ________.
3. This bike is new. (改为复数句子)
________ bikes ________ new.
4. We played basketball yesterday afternoon. (对划线部分提问)
________ ________ you ________ yesterday afternoon?
5. He is too short. He can't reach the banana. (改为一句话)
He is ________ short ________ ________ the banana.
对于埋地管道所用的高密度聚乙烯，国际标准规定拉伸强度不低于（）
