阅读理解 Your home is a safe place, right? Think again. Many serious accidents happen in people's homes. Can you prevent these accidents? Yes. Many accidents happen because people are careless. So be careful! Here are some tips about safety. ●Don't stand on chairs. Many people may fall off chairs and hurt themselves. ●Keep the floor dry, and you won't slip (滑) or fall. ●Be away from matches. Even a cigarette can easily start a fire. Don't use water to put out fires. Use salt instead. ●Be careful with knives! Many people cut themselves in the kitchen. Never touch the broken bottles, doors or windows. Glass can also cause the most serious cuts. ●Don't keep poisons (毒药)in the kitchen. ●Never use electrical appliances (电器) in the shower. Dry the floor before you use them, or electricity can hurt you! ●Keep children away from hot water and hot drinks. They can be dangerous. But adults often forget it. ●Look through the peephole(门镜) when you hear the knock on the door. Don't let strangers in. In a word, we should learn to protect ourselves and stay away from danger. 根据短文内容,判断下列句子正误(T or F) (     )1. You must be careful when there is water on the floor. (      )2. Salt can't be used for putting out fires. (      )3. It's not safe to use electrical appliances in the shower while the floor is wet. (      )4. Water and drinks can be dangerous for both children and adults. (      )5. Open the door at once when you hear someone knocking at the door