小练(7) Unit 3 Section 1 Reading and Thinking—Prereading-【赢在微点】轻松课堂2023-2024学年新教材高中英语选择性必修第二册（人教版）

小练(七)　UNIT 3　Section 1 熟练高考题型 阅读理解　A　体裁:说明文　主题语境:健康生活　难度:★★☆☆☆ 　 　　Vaping (吸电子烟) is becoming booming these days. The basic idea behind this is simple: vaping is a way of taking in nicotine (and other substances) that is far safer than smoking, because vapes produce far lower levels of the most harmful chemicals than cigarettes, as the World Health Organization notes. But there are several obvious issues with this. Firstly, there is enormous variability in vaping products and devices. The market is largely unregulated, which means the term “vape” covers everything from solid, reliable devices to something that will explode when you put it in your mouth. Switching from smoking to vaping is probably good for your health, but the epidemiological (流行病学的) evidence shows that most people become what􀆳s known as “dual users” who both vape and smoke in differing amounts. Because of their different smoking regimes (养生法,方法), the evidence on whether dual use is more beneficial than just smoking is unclear. Vaping is obviously worse for your health than quitting completely. In an experimental study led by Prof David Thickett in the University of Birmingham, the researchers designed a mechanical procedure to mimic (模拟) vaping in the laboratory, using lung tissue samples provided by eight nonsmokers. They found that vapor (蒸汽,雾) of vaping damaged the activity of alveolar macrophages (肺泡巨噬细胞), cells that remove potentially damaging dust particles and bacteria. They said some of the effects were similar to those seen in regular smokers and people with chronic lung disease. Moreover, there􀆳s pretty good evidence that vaping nicotine products is habit⁃forming and addictive, and there􀆳s a great deal of concern among epidemiologists that in young people vaping can lead to smoking, which is obviously a bad thing. 　　【语篇解读】　本文是一篇说明文。文章从不同方面介绍了吸电子烟所存在的几个问题。 好词　①boom v. 激增;迅速发展 ②variability n. 易变性;可变性 ③addictive adj. 使人上瘾的 1.Which of the following is the most harmful to our health accord