When I was five years old. I took a boat out on the river and went fishing by myself. I really wanted to catch a fish! But they were not biting.

    I stayed in my boat for three days, waiting. A few times, I thought I felt a fish at the end of the line. The first time I pulled in my catch, it was not a fish; it was an old bag. The second time, it was a shoe. Finally, at the end of the third day, I felt a strong pull at the end of the line. The pull was so strong they my boat raced around and around. I needed all my power just to hold onto the fishing rod. I pulled, and I pulled and I caught the biggest fish that ever swam on the Earth! It was heavier than everyone in this room put together! Then something terrible happened!

    After I pulled the huge fish into my boat, I saw that the boat was going under water! Water was coming into the boat from all sides! I was not a very good swimmer, so I was scared.

    Although it was the hardest choice I ever made. I had to let the fish go. I pushed it back over the side of the boat, and we waved good-bye to each other as it swam away.

当木棍上形成了三个点并绕着支点旋转时，这根木棍就是杠杆，而单放在地上的木棍只是单纯的一棍木棍，不能说是杠杆。（  ）

李强和张明是一对好朋友。放假期间，两人一起在李强家里玩网络游戏。李强见张明玩得很带劲，又不好意思叫他回家，就主动把家里闲置的一台价值五千元的笔记本电脑借给张明拿回家玩游戏。哪知张明对笔记本电脑操作不当，致使电脑损坏。事后，李强向张明提出赔偿要求，但张明认为电脑是李强主动借给自己的，觉得没有必要赔偿。两人为电脑一事闹得不可开交。