人体离不开营养物质，大米作为重要的粮食作物，为人体的生命活动提供了能量保障。全球半数以上的人口以大米为主食。我国科学院院士袁隆平先生用野生水稻与普通水稻杂交，培育出了高产的杂交水稻，为解决人类的粮食危机做出了巨大贡献。下面是大米在人体内的主要变化，请分析回答问题：

植物细胞分裂的顺序是（    ）

①细胞质分成两个部分，每一部分含有一个细胞核      

②细胞核一分为二，成为两个细胞核

③新细胞核之间的细胞质中央形成新的细胞膜         

④产生新的细胞壁．

   It was reported that a fire broke out in a tall building in Beijing on Thursday afternoon. No one was killed in the fire. The building, which caught fire, is near the three-tower shopping and office complex(综合体) named Xihuan Plaza. One of the three towers was in heavy smoke because of the polyfoam（泡沫塑料）outside. The fire was put out at about 3:34 pm, 16 minutes after the firemen received alarms（报警）.
   Witnesses said the fire broke out at about 3:15 pm. The shopping center had people inside evacuated（疏散）shortly after the fire. By 4:50 pm, all the workers from the center returned.
   The fire happened on a ____ , when people were working in the office.
   When the firemen put out the fire, the fire lasted for____  minutes.
   pThe workers went back to work ____  an hour after the fire was put out.
   Though the fire frightened people there, it killed ____ .
   The fire didn’t____  until it was 3:34.