小明学习《中国人民站起来了》一课后，写了以下的读书笔记，其中有四处错误，请你找出并加以改正。
1948年10月1日，首都30万群众在 * * 广场集会，隆重举行开国大典。刘 * * 庄严地向全世界宣告：“中华人民共和国中央人民政府今天成立了！”10月1日成为我国的国庆纪念日。 中华民国的成立，结束了帝国主义勾结封建统治者剥削压迫中国人民的历史，实现了民族的解放和国家的独立。中国历史从此揭开了新的篇章。 在中 * * 政策的感召下，1951年5月，新疆和平解放，标志祖国大陆实现了统一。
（1）错误： 改正为：
（2）错误： 改正为：
（3）错误： 改正为：
（4）错误： 改正为：
（1）错误：1948年； 改正：1949年；
（2）错误：刘 * * ；改正：毛 * * ；
（3）错误：中华民国；改正：中华人民共和国（新中国）；
（4）错误：新疆；改正：西藏。
Computers can injure(伤害)you. Most other injuries happen suddenly．For example，if you fall off a bike and break your arms, it happens very quickly. But computer injuries happen slowly． You probably know how to ride a bike safely. Now learn to use a computer safely．  Your eyes Too much light can injure your eyes, so never sit too close to a computer screen. Your eyes should be more than 50 centimeters from the screen. Don’t forget to look away from it sometimes. This gives your eyes a rest． When you use a computer, the window should be on your left or your right. If it is behind you, the light will reflect on(反射)the screen. If the window is in front of you，the sun and the screen will both shine into your eyes． Your hands and wrists(手腕) Hand and wrist injuries can happen because the hands and wrists are moved in the same way hundreds of times. If you use a keyboard for a long time, follow these three rules: 1) Rest your wrists on something. 2) Keep your elbows(肘)as high as the keyboard. 3) Stop sometimes and exercise your hands, wrists and fingers in a different way． Your back Some people sit for many hours in front of a computer. If you sit in the wrong way, you can injure your back or your neck. So you shouldn’t bend your back when you sit. The top part of the screen should be in front of your eyes. Your forearms, wrists, hands and the upper part of your legs should all be parallel(平行)to the floor. If you are sitting for a long time, get up every half an hour and exercise your arms, legs and neck． Enjoy your computer, but use it safely．
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