点电荷，从静电场中的a点移到b点，其电势能的变化为零，则（   ）

当年红军野外行军时，常会有人员和马匹陷入沼泽中，你认为这是红军经过下列哪种生态系统（  ）

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

2）只允许修改10处，多者（从第11处起）不计分。

    Time waits for no man. This is something I learned very clear last term. I spent so much time fool around that my grades began to fall. I finally realize that something necessary had to done. It was time of a change.

    Now I have a new plan for using my time wisely. I have set my alarm clock ahead half a hour. This will give him a head start on the day. I have also been decided to keep a record of what I do and when I do it. Looking back on which I've done will give me some idea on how to rearrange my time.

1）简述你想改变的这一行为习惯；

2）说明你改变这一习惯的理由及措施；

3）字数100左右。