题目

阅读理解 Hello! I’m Mary. I’m going to have a busy weekend. On Saturday morning, I’m going to the Beach Park with my friends. We are going to ride bikes there because we can do some sightseeing on the way. We are going to play on the beach. In the midday, we are going to have a picnic in the park. In the afternoon, we are going to visit our English teacher. She wants us to go to her home and help us with our English. In the evening, I’m going to visit my aunt with my mother, because it’s my cousin’s birthday. There is going to be a party in her house. On Sunday morning将一个刚出芽的马铃薯块茎切成大小大相同的4块，每块均带有芽眼．取4个同样大小、质地相同的花盆，分别装满同样的泥土，将每块分别埋于4个花盆约5cm深处的沙土中，按下表要求连续管理培植20天．请回答：花盆温度光照水1号20℃黑暗适量2号20℃充足适量3号20℃充足不浇水4号20℃充足持续过量①生长状况最佳的是 号花盆中的马铃薯．②4号花盆中的马铃薯最终死亡，原因是 ．③马铃薯的这种繁殖方式属于 ，其优点是 ．