题目

已知有关物质的熔、沸点数据如下表： MgOAl2O3MgCl2AlCl3 熔点（℃）28522045714190（2.5×105Pa） 沸点（℃）360029801412177.8 （1）工业上常用电解熔融MgCl2的方法生产金属镁；用电解Al2O3与冰晶石熔融混合物的方法生产铝。不用电解MgO的方法生产镁的原因是：___▲____； AlCl3可能为___▲____晶体。 （2）请设计可靠的实验证明MgCl2、AlCl3所属化合物的类型，其实验方法是_____▲____ 。 （3）AlCl3具有以下__▲__特殊性质（请填序号）。①液化 ②挥发 ③升华从方框中的A～E选项中选择正确的选项填入文中空白处,使短文完整、通顺。Healthy eating is important for us.1. So don't go to school without it. Fruit and vegetables are good for your health, but fast food will make you fat and unhealthy.2. We should eat more fruit and vegetables and less meat. A glass of milk and an egg a day can help make us strong.3.Playing sports can also help you keep fit.4. So stay safe when you are doing sports. It's necessary to learn about first aid. Then you can help yourself or others if an accident happens.You must stop smoking and drinking. Many students think it's cool to smoke and drink. But they don't know they can cause many illnesses(疾病)．5.A．It's important for us to have healthy eating habits.B．They are bad for our health.C．Breakfast gives you enough energy(能量)for the morning.D．But sometimes it may cause accidents(引发事故)．E．So eat the right food to keep you healthy.