小明同学在做完“观察水的沸腾”实验后又进一步研究了沸水自然冷却过程中温度随时间的变化情况，将实验数据记录在下表中，完成下面各题：

    This is my school. There are many trees and flowers in it. The teaching building is big and tall. There is a big playground in our school. After 4:30 in the afternoon, many students come to the playground to play football and some students play table tennis in the table tennis room.
There are 1,200 students in 25 classes in our school. The students all like to study. The teachers in our school are very good. They help the students to study and the students like them, too.

写出课文中所描写的人物，再选择填写人物的特点。

A．爱财吝啬    B．富有心计    C．技艺高超

①他还给自己立下一个规矩，只要身上有白点，白刷不要钱。

人物：____    特点：____

②他听了这话，把眼闭着摇头，那手只是指着不动。

人物：____    特点：____

③总想使巧招，下冷绊子。

人物：____    特点：____

某种细菌在培养过程中，每半小时分裂1次，每次一分为二．若这种细菌由1个分裂到32个，那么这个过程要经过(      )