专题13 阅读理解说明文-组合练20篇-2022-2023学年寒假高二英语轻松突破重难点查漏补缺组合练

专题13 阅读理解说明文 组合练20篇 2022-2023学年寒假高二英语轻松突破重难点查漏补缺组合练 （原卷版） （一） In 1970, American magician Rick Johnsson theorized that when magic tricks seem too perfect, audiences are less impressed and can easily figure out their secrets. Johnsson knew few people believed magicians had supernatural powers because they feel certain there is a rational explanation for magic, and it’s often science. What’s the science behind popular magic tricks? Let’s take a look. Levitating(悬浮)objects A popular trick is making objects levitate, with smaller objects being especially easy to “fly”. To the viewer, the levitating object may seem to resist gravity, but there’s a simple explanation—quantum (量子)physics. Magicians coat an object in a layer of magnetic paint and place it on top of a superconductor cooled by liquid nitrogen. The opposing forces cause the object to float above the superconductor. Vanishing liquids Many magicians can make liquids disappear. The explanation is simple—chemistry. Sodium polyacrylate, also known as “waterlock”, is a chennical compound that can absorb liquids. It’s used in everyday products such as baby diapers. What’s magical about this compound is that it can absorb 100 to 1000 times its mass in liquid. When a magician pours water into a cup lined with sodium polyacrylate, the water is quickly absorbed. Burning paper Another interesting trick is when magicians set paper on fire, it remains undamaged. Magicians can even use money in this trick. However, there’s a scientific explanation-chemistry! The item is dipped in a mixture of alcohol and water before the trick. When it’s lit on fire, the alcohol covering the paper begins to burn. Alcohol burns and changes into gas at a much lower temperature than water, so the water protects the paper from burning. 1．Where is this passage most likely from? A．Science fiction. B．A textbook. C．The popular press. D．A news report. 2．What may be involved in Levitating objects? A．Waterlock and a superconductor. B．Magnets and low